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NAME

     Config - access Perl configuration information



SYNOPSIS
         use Config;
         if ($Config{'cc'} =~ /gcc/) {
             print "built by gcc\n";
         }

         use Config qw(myconfig config_sh config_vars);

         print myconfig();

         print config_sh();

         config_vars(qw(osname archname));




DESCRIPTION
     The Config module contains all the information that was
     available to the `Configure' program at Perl build time
     (over 900 values).

     Shell variables from the config.sh file (written by
     Configure) are stored in the readonly-variable `%Config',
     indexed by their names.

     Values stored in config.sh as 'undef' are returned as
     undefined values.  The perl `exists' function can be used to
     check if a named variable exists.

     myconfig()
         Returns a textual summary of the major perl
         configuration values.  See also `-V' in the Switches
         entry in the perlrun manpage.

     config_sh()
         Returns the entire perl configuration information in the
         form of the original config.sh shell variable assignment
         script.

     config_vars(@names)
         Prints to STDOUT the values of the named configuration
         variable. Each is printed on a separate line in the
         form:

           name='value';

         Names which are unknown are output as `name='UNKNOWN';'.
         See also `-V:name' in the Switches entry in the perlrun
         manpage.



EXAMPLE
     Here's a more sophisticated example of using %Config:

         use Config;
         use strict;

         my %sig_num;
         my @sig_name;
         unless($Config{sig_name} && $Config{sig_num}) {
             die "No sigs?";
         } else {
             my @names = split ' ', $Config{sig_name};
             @sig_num{@names} = split ' ', $Config{sig_num};
             foreach (@names) {
                 $sig_name[$sig_num{$_}] ||= $_;
             }
         }

         print "signal #17 = $sig_name[17]\n";
         if ($sig_num{ALRM}) {
             print "SIGALRM is $sig_num{ALRM}\n";
         }




WARNING
     Because this information is not stored within the perl
     executable itself it is possible (but unlikely) that the
     information does not relate to the actual perl binary which
     is being used to access it.

     The Config module is installed into the architecture and
     version specific library directory ($Config{installarchlib})
     and it checks the perl version number when loaded.

     The values stored in config.sh may be either single-quoted
     or double-quoted. Double-quoted strings are handy for those
     cases where you need to include escape sequences in the
     strings. To avoid runtime variable interpolation, any `$'
     and `@' characters are replaced by `\$' and `\@',
     respectively. This isn't foolproof, of course, so don't
     embed `\$' or `\@' in double-quoted strings unless you're
     willing to deal with the consequences. (The slashes will end
     up escaped and the `$' or `@' will trigger variable
     interpolation)



GLOSSARY
     Most `Config' variables are determined by the `Configure'
     script on platforms supported by it (which is most UNIX
     platforms).  Some platforms have custom-made `Config'
     variables, and may thus not have some of the variables
     described below, or may have extraneous variables specific
     to that particular port.  See the port specific
     documentation in such cases.

     _

     `_a'
         From Unix.U:

         This variable defines the extension used for ordinary
         libraries.  For unix, it is .a.  The . is included.
         Other possible values include .lib.

     `_exe'
         From Unix.U:

         This variable defines the extension used for executable
         files.  For unix it is empty.  Other possible values
         include .exe.

     `_o'
         From Unix.U:

         This variable defines the extension used for object
         files.  For unix, it is .o.  The . is included.  Other
         possible values include .obj.

     a

     `afs'
         From afs.U:

         This variable is set to `true' if `AFS' (Andrew File
         System) is used on the system, `false' otherwise.  It is
         possible to override this with a hint value or command
         line option, but you'd better know what you are doing.

     `alignbytes'
         From alignbytes.U:

         This variable holds the number of bytes required to
         align a double-- or a long double when applicable. Usual
         values are 2, 4 and 8.  The default is eight, for
         safety.

     `ansi2knr'
         From ansi2knr.U:

         This variable is set if the user needs to run ansi2knr.
         Currently, this is not supported, so we just abort.

     `aphostname'
         From d_gethname.U:

         This variable contains the command which can be used to
         compute the host name. The command is fully qualified by
         its absolute path, to make it safe when used by a
         process with super-user privileges.

     `api_revision'
         From patchlevel.U:

         The three variables, api_revision, api_version, and
         api_subversion, specify the version of the oldest perl
         binary compatible with the present perl.  In a full
         version string such as 5.6.1, api_revision is the `5'.
         Prior to 5.5.640, the format was a floating point
         number, like 5.00563.

                 F<perl.c>:incpush() and F<lib/lib.pm> will automatically search in

                 $F<sitelib/.>. for older directories back to the limit specified
         by these api_ variables.  This is only useful if you have a
         perl library directory tree structured like the default one.
         See C<INSTALL> for how this works.  The versioned site_perl
         directory was introduced in 5.005, so that is the lowest
         possible value.  The version list appropriate for the current
         system is determined in F<inc_version_list.U>.

                 C<XXX> To do:  Since compatibility can depend on compile time

                 options (such as bincompat, longlong, F<etc.>) it should
         (perhaps) be set by Configure, but currently it isn't.
         Currently, we read a hard-wired value from F<patchlevel.h>.
         Perhaps what we ought to do is take the hard-wired value from
         F<patchlevel.h> but then modify it if the current Configure
         options warrant.  F<patchlevel.h> then would use an #ifdef guard.


     `api_subversion'
         From patchlevel.U:

         The three variables, api_revision, api_version, and
         api_subversion, specify the version of the oldest perl
         binary compatible with the present perl.  In a full
         version string such as 5.6.1, api_subversion is the `1'.
         See api_revision for full details.

     `api_version'
         From patchlevel.U:

         The three variables, api_revision, api_version, and
         api_subversion, specify the version of the oldest perl
         binary compatible with the present perl.  In a full
         version string such as 5.6.1, api_version is the `6'.
         See api_revision for full details.  As a special case,
         5.5.0 is rendered in the old-style as 5.005.  (In the
         5.005_0x maintenance series, this was the only versioned
         directory in $sitelib.)

     `api_versionstring'
         From patchlevel.U:

         This variable combines api_revision, api_version, and
         api_subversion in a format such as 5.6.1 (or 5_6_1)
         suitable for use as a directory name.  This is
         filesystem dependent.

     `ar'
         From Loc.U:

         This variable is used internally by Configure to
         determine the full pathname (if any) of the ar program.
         After Configure runs, the value is reset to a plain `ar'
         and is not useful.

     `archlib'
         From archlib.U:

         This variable holds the name of the directory in which
         the user wants to put architecture-dependent public
         library files for $package.  It is most often a local
         directory such as /usr/local/lib.  Programs using this
         variable must be prepared to deal with filename
         expansion.

     `archlibexp'
         From archlib.U:

         This variable is the same as the archlib variable, but
         is filename expanded at configuration time, for
         convenient use.

     `archname64'
         From use64bits.U:

         This variable is used for the 64-bitness part of
         $archname.

     `archname'
         From archname.U:

         This variable is a short name to characterize the
         current architecture.  It is used mainly to construct
         the default archlib.

     `archobjs'
         From Unix.U:
         This variable defines any additional objects that must
         be linked in with the program on this architecture.  On
         unix, it is usually empty.  It is typically used to
         include emulations of unix calls or other facilities.
         For perl on OS/2, for example, this would include
         os2/os2.obj.

     `awk'
         From Loc.U:

         This variable is used internally by Configure to
         determine the full pathname (if any) of the awk program.
         After Configure runs, the value is reset to a plain
         `awk' and is not useful.

     b

     `baserev'
         From baserev.U:

         The base revision level of this package, from the
         .package file.

     `bash'
         From Loc.U:

         This variable is defined but not used by Configure.  The
         value is a plain '' and is not useful.

     `bin'
         From bin.U:

         This variable holds the name of the directory in which
         the user wants to put publicly executable images for the
         package in question.  It is most often a local directory
         such as /usr/local/bin. Programs using this variable
         must be prepared to deal with ~name substitution.

     `bincompat5005'
         From bincompat5005.U:

         This variable contains y if this version of Perl should
         be binary-compatible with Perl 5.005.

     `binexp'
         From bin.U:

         This is the same as the bin variable, but is filename
         expanded at configuration time, for use in your
         makefiles.


     `bison'
         From Loc.U:

         This variable is defined but not used by Configure.  The
         value is a plain '' and is not useful.

     `byacc'
         From Loc.U:

         This variable is used internally by Configure to
         determine the full pathname (if any) of the byacc
         program.  After Configure runs, the value is reset to a
         plain `byacc' and is not useful.

     `byteorder'
         From byteorder.U:

         This variable holds the byte order. In the following,
         larger digits indicate more significance.  The variable
         byteorder is either 4321 on a big-endian machine, or
         1234 on a little-endian, or 87654321 on a Cray ... or
         3412 with weird order !

     c

     `c' From n.U:

         This variable contains the \c string if that is what
         causes the echo command to suppress newline.  Otherwise
         it is null.  Correct usage is $echo $n "prompt for a
         question: $c".

     `castflags'
         From d_castneg.U:

         This variable contains a flag that precise difficulties
         the compiler has casting odd floating values to unsigned
         long:  0 = ok 1 = couldn't cast < 0 2 = couldn't cast >=
         0x80000000 4 = couldn't cast in argument expression list

     `cat'
         From Loc.U:

         This variable is used internally by Configure to
         determine the full pathname (if any) of the cat program.
         After Configure runs, the value is reset to a plain
         `cat' and is not useful.

     `cc'
         From cc.U:

         This variable holds the name of a command to execute a C
         compiler which can resolve multiple global references
         that happen to have the same name.  Usual values are
         `cc', `Mcc', `cc -M', and `gcc'.

     `cccdlflags'
         From dlsrc.U:

         This variable contains any special flags that might need
         to be passed with `cc -c' to compile modules to be used
         to create a shared library that will be used for dynamic
         loading.  For hpux, this should be +z.  It is up to the
         makefile to use it.

     `ccdlflags'
         From dlsrc.U:

         This variable contains any special flags that might need
         to be passed to cc to link with a shared library for
         dynamic loading.  It is up to the makefile to use it.
         For sunos 4.1, it should be empty.

     `ccflags'
         From ccflags.U:

         This variable contains any additional C compiler flags
         desired by the user.  It is up to the Makefile to use
         this.

     `ccsymbols'
         From Cppsym.U:

         The variable contains the symbols defined by the C
         compiler alone.  The symbols defined by cpp or by cc
         when it calls cpp are not in this list, see cppsymbols
         and cppccsymbols.  The list is a space-separated list of
         symbol=value tokens.

     `cf_by'
         From cf_who.U:

         Login name of the person who ran the Configure script
         and answered the questions. This is used to tag both
         config.sh and config_h.SH.

     `cf_email'
         From cf_email.U:

         Electronic mail address of the person who ran Configure.
         This can be used by units that require the user's e-
         mail, like MailList.U.


     `cf_time'
         From cf_who.U:

         Holds the output of the `date' command when the
         configuration file was produced. This is used to tag
         both config.sh and config_h.SH.

     `charsize'
         From charsize.U:

         This variable contains the value of the `CHARSIZE'
         symbol, which indicates to the C program how many bytes
         there are in a character.

     `chgrp'
         From Loc.U:

         This variable is defined but not used by Configure.  The
         value is a plain '' and is not useful.

     `chmod'
         From Loc.U:

         This variable is defined but not used by Configure.  The
         value is a plain '' and is not useful.

     `chown'
         From Loc.U:

         This variable is defined but not used by Configure.  The
         value is a plain '' and is not useful.

     `clocktype'
         From d_times.U:

         This variable holds the type returned by times(). It can
         be long, or clock_t on `BSD' sites (in which case
         <sys/types.h> should be included).

     `comm'
         From Loc.U:

         This variable is used internally by Configure to
         determine the full pathname (if any) of the comm
         program.  After Configure runs, the value is reset to a
         plain `comm' and is not useful.

     `compress'
         From Loc.U:

         This variable is defined but not used by Configure.  The
         value is a plain '' and is not useful.

     C

     `CONFIGDOTSH'
         From Oldsyms.U:

         This is set to `true' in config.sh so that a shell
         script sourcing config.sh can tell if it has been
         sourced already.

     `contains'
         From contains.U:

         This variable holds the command to do a grep with a
         proper return status.  On most sane systems it is simply
         `grep'.  On insane systems it is a grep followed by a
         cat followed by a test.  This variable is primarily for
         the use of other Configure units.

     `cp'
         From Loc.U:

         This variable is used internally by Configure to
         determine the full pathname (if any) of the cp program.
         After Configure runs, the value is reset to a plain `cp'
         and is not useful.

     `cpio'
         From Loc.U:

         This variable is defined but not used by Configure.  The
         value is a plain '' and is not useful.

     `cpp'
         From Loc.U:

         This variable is used internally by Configure to
         determine the full pathname (if any) of the cpp program.
         After Configure runs, the value is reset to a plain
         `cpp' and is not useful.

     `cpp_stuff'
         From cpp_stuff.U:

         This variable contains an identification of the
         catenation mechanism used by the C preprocessor.

     `cppccsymbols'
         From Cppsym.U:

         The variable contains the symbols defined by the C
         compiler when it calls cpp.  The symbols defined by the
         cc alone or cpp alone are not in this list, see
         ccsymbols and cppsymbols.  The list is a space-separated
         list of symbol=value tokens.

     `cppflags'
         From ccflags.U:

         This variable holds the flags that will be passed to the
         C pre- processor. It is up to the Makefile to use it.

     `cpplast'
         From cppstdin.U:

         This variable has the same functionality as cppminus,
         only it applies to cpprun and not cppstdin.

     `cppminus'
         From cppstdin.U:

         This variable contains the second part of the string
         which will invoke the C preprocessor on the standard
         input and produce to standard output.  This variable
         will have the value `-' if cppstdin needs a minus to
         specify standard input, otherwise the value is "".

     `cpprun'
         From cppstdin.U:

         This variable contains the command which will invoke a C
         preprocessor on standard input and put the output to
         stdout. It is guaranteed not to be a wrapper and may be
         a null string if no preprocessor can be made directly
         available. This preprocessor might be different from the
         one used by the C compiler. Don't forget to append
         cpplast after the preprocessor options.

     `cppstdin'
         From cppstdin.U:

         This variable contains the command which will invoke the
         C preprocessor on standard input and put the output to
         stdout.  It is primarily used by other Configure units
         that ask about preprocessor symbols.

     `cppsymbols'
         From Cppsym.U:

         The variable contains the symbols defined by the C
         preprocessor alone.  The symbols defined by cc or by cc
         when it calls cpp are not in this list, see ccsymbols
         and cppccsymbols.  The list is a space-separated list of
         symbol=value tokens.

     `crosscompile'
         From crosscompile.U:

         This variable conditionally defines the `CROSSCOMPILE'
         symbol which signifies that the build process is be a
         cross-compilation.  This is normally set by hints files
         or from Configure command line.

     `cryptlib'
         From d_crypt.U:

         This variable holds -lcrypt or the path to a libcrypt.a
         archive if the crypt() function is not defined in the
         standard C library. It is up to the Makefile to use
         this.

     `csh'
         From Loc.U:

         This variable is used internally by Configure to
         determine the full pathname (if any) of the csh program.
         After Configure runs, the value is reset to a plain
         `csh' and is not useful.

     d

     `d_access'
         From d_access.U:

         This variable conditionally defines `HAS_ACCESS' if the
         access() system call is available to check for access
         permissions using real IDs.

     `d_accessx'
         From d_accessx.U:

         This variable conditionally defines the `HAS_ACCESSX'
         symbol, which indicates to the C program that the
         accessx() routine is available.

     `d_alarm'
         From d_alarm.U:

         This variable conditionally defines the `HAS_ALARM'
         symbol, which indicates to the C program that the
         alarm() routine is available.

     `d_archlib'
         From archlib.U:

         This variable conditionally defines `ARCHLIB' to hold
         the pathname of architecture-dependent library files for
         $package.  If $archlib is the same as $privlib, then
         this is set to undef.

     `d_atolf'
         From atolf.U:

         This variable conditionally defines the `HAS_ATOLF'
         symbol, which indicates to the C program that the
         atolf() routine is available.

     `d_atoll'
         From atoll.U:

         This variable conditionally defines the `HAS_ATOLL'
         symbol, which indicates to the C program that the
         atoll() routine is available.

     `d_attribut'
         From d_attribut.U:

         This variable conditionally defines `HASATTRIBUTE',
         which indicates the C compiler can check for function
         attributes, such as printf formats.

     `d_bcmp'
         From d_bcmp.U:

         This variable conditionally defines the `HAS_BCMP'
         symbol if the bcmp() routine is available to compare
         strings.

     `d_bcopy'
         From d_bcopy.U:

         This variable conditionally defines the `HAS_BCOPY'
         symbol if the bcopy() routine is available to copy
         strings.

     `d_bincompat5005'
         From bincompat5005.U:

         This variable conditionally defines BINCOMPAT5005 so
         that embed.h can take special action if this version of
         Perl should be binary-compatible with Perl 5.005.  This
         is impossible for builds that use features like threads
         and multiplicity it is always $undef for those versions.

     `d_bsd'
         From Guess.U:

         This symbol conditionally defines the symbol `BSD' when
         running on a `BSD' system.

     `d_bsdgetpgrp'
         From d_getpgrp.U:

         This variable conditionally defines `USE_BSD_GETPGRP' if
         getpgrp needs one arguments whereas `USG' one needs
         none.

     `d_bsdsetpgrp'
         From d_setpgrp.U:

         This variable conditionally defines `USE_BSD_SETPGRP' if
         setpgrp needs two arguments whereas `USG' one needs
         none.  See also d_setpgid for a `POSIX' interface.

     `d_bzero'
         From d_bzero.U:

         This variable conditionally defines the `HAS_BZERO'
         symbol if the bzero() routine is available to set memory
         to 0.

     `d_casti32'
         From d_casti32.U:

         This variable conditionally defines CASTI32, which
         indicates whether the C compiler can cast large floats
         to 32-bit ints.

     `d_castneg'
         From d_castneg.U:

         This variable conditionally defines `CASTNEG', which
         indicates wether the C compiler can cast negative float
         to unsigned.

     `d_charvspr'
         From d_vprintf.U:

         This variable conditionally defines `CHARVSPRINTF' if
         this system has vsprintf returning type (char*).  The
         trend seems to be to declare it as "int vsprintf()".

     `d_chown'
         From d_chown.U:

         This variable conditionally defines the `HAS_CHOWN'
         symbol, which indicates to the C program that the
         chown() routine is available.

     `d_chroot'
         From d_chroot.U:

         This variable conditionally defines the `HAS_CHROOT'
         symbol, which indicates to the C program that the
         chroot() routine is available.

     `d_chsize'
         From d_chsize.U:

         This variable conditionally defines the `CHSIZE' symbol,
         which indicates to the C program that the chsize()
         routine is available to truncate files.  You might need
         a -lx to get this routine.

     `d_closedir'
         From d_closedir.U:

         This variable conditionally defines `HAS_CLOSEDIR' if
         closedir() is available.

     `d_const'
         From d_const.U:

         This variable conditionally defines the `HASCONST'
         symbol, which indicates to the C program that this C
         compiler knows about the const type.

     `d_crypt'
         From d_crypt.U:

         This variable conditionally defines the `CRYPT' symbol,
         which indicates to the C program that the crypt()
         routine is available to encrypt passwords and the like.

     `d_csh'
         From d_csh.U:

         This variable conditionally defines the `CSH' symbol,
         which indicates to the C program that the C-shell
         exists.

     `d_cuserid'
         From d_cuserid.U:

         This variable conditionally defines the `HAS_CUSERID'
         symbol, which indicates to the C program that the
         cuserid() routine is available to get character login
         names.

     `d_dbl_dig'
         From d_dbl_dig.U:

         This variable conditionally defines d_dbl_dig if this
         system's header files provide `DBL_DIG', which is the
         number of significant digits in a double precision
         number.

     `d_difftime'
         From d_difftime.U:

         This variable conditionally defines the `HAS_DIFFTIME'
         symbol, which indicates to the C program that the
         difftime() routine is available.

     `d_dirnamlen'
         From i_dirent.U:

         This variable conditionally defines `DIRNAMLEN', which
         indicates to the C program that the length of directory
         entry names is provided by a d_namelen field.

     `d_dlerror'
         From d_dlerror.U:

         This variable conditionally defines the `HAS_DLERROR'
         symbol, which indicates to the C program that the
         dlerror() routine is available.

     `d_dlopen'
         From d_dlopen.U:

         This variable conditionally defines the `HAS_DLOPEN'
         symbol, which indicates to the C program that the
         dlopen() routine is available.

     `d_dlsymun'
         From d_dlsymun.U:

         This variable conditionally defines
         `DLSYM_NEEDS_UNDERSCORE', which indicates that we need
         to prepend an underscore to the symbol name before
         calling dlsym().

     `d_dosuid'
         From d_dosuid.U:

         This variable conditionally defines the symbol `DOSUID',
         which tells the C program that it should insert setuid
         emulation code on hosts which have setuid #! scripts
         disabled.

     `d_drand48proto'
         From d_drand48proto.U:

         This variable conditionally defines the
         HAS_DRAND48_PROTO symbol, which indicates to the C
         program that the system provides a prototype for the
         drand48() function.  Otherwise, it is up to the program
         to supply one.

     `d_dup2'
         From d_dup2.U:

         This variable conditionally defines HAS_DUP2 if dup2()
         is available to duplicate file descriptors.

     `d_eaccess'
         From d_eaccess.U:

         This variable conditionally defines the `HAS_EACCESS'
         symbol, which indicates to the C program that the
         eaccess() routine is available.

     `d_endgrent'
         From d_endgrent.U:

         This variable conditionally defines the `HAS_ENDGRENT'
         symbol, which indicates to the C program that the
         endgrent() routine is available for sequential access of
         the group database.

     `d_endhent'
         From d_endhent.U:

         This variable conditionally defines `HAS_ENDHOSTENT' if
         endhostent() is available to close whatever was being
         used for host queries.

     `d_endnent'
         From d_endnent.U:

         This variable conditionally defines `HAS_ENDNETENT' if
         endnetent() is available to close whatever was being
         used for network queries.

     `d_endpent'
         From d_endpent.U:

         This variable conditionally defines `HAS_ENDPROTOENT' if
         endprotoent() is available to close whatever was being
         used for protocol queries.

     `d_endpwent'
         From d_endpwent.U:

         This variable conditionally defines the `HAS_ENDPWENT'
         symbol, which indicates to the C program that the
         endpwent() routine is available for sequential access of
         the passwd database.

     `d_endsent'
         From d_endsent.U:

         This variable conditionally defines `HAS_ENDSERVENT' if
         endservent() is available to close whatever was being
         used for service queries.

     `d_endspent'
         From d_endspent.U:

         This variable conditionally defines `HAS_ENDSPENT' if
         endspent() is available to finalize the scan of SysV
         shadow password entries.

     `d_eofnblk'
         From nblock_io.U:

         This variable conditionally defines `EOF_NONBLOCK' if
         `EOF' can be seen when reading from a non-blocking I/O
         source.

     `d_eunice'
         From Guess.U:

         This variable conditionally defines the symbols `EUNICE'
         and `VAX', which alerts the C program that it must deal
         with ideosyncracies of `VMS'.

     `d_fchmod'
         From d_fchmod.U:

         This variable conditionally defines the `HAS_FCHMOD'
         symbol, which indicates to the C program that the
         fchmod() routine is available to change mode of opened
         files.

     `d_fchown'
         From d_fchown.U:

         This variable conditionally defines the `HAS_FCHOWN'
         symbol, which indicates to the C program that the
         fchown() routine is available to change ownership of
         opened files.

     `d_fcntl'
         From d_fcntl.U:

         This variable conditionally defines the `HAS_FCNTL'
         symbol, and indicates whether the fcntl() function
         exists

     `d_fd_macros'
         From d_fd_set.U:

         This variable contains the eventual value of the
         `HAS_FD_MACROS' symbol, which indicates if your C
         compiler knows about the macros which manipulate an
         fd_set.

     `d_fd_set'
         From d_fd_set.U:

         This variable contains the eventual value of the
         `HAS_FD_SET' symbol, which indicates if your C compiler
         knows about the fd_set typedef.

     `d_fds_bits'
         From d_fd_set.U:

         This variable contains the eventual value of the
         `HAS_FDS_BITS' symbol, which indicates if your fd_set
         typedef contains the fds_bits member.  If you have an
         fd_set typedef, but the dweebs who installed it did a
         half-fast job and neglected to provide the macros to
         manipulate an fd_set, `HAS_FDS_BITS' will let us know
         how to fix the gaffe.

     `d_fgetpos'
         From d_fgetpos.U:

         This variable conditionally defines `HAS_FGETPOS' if
         fgetpos() is available to get the file position
         indicator.

     `d_flexfnam'
         From d_flexfnam.U:

         This variable conditionally defines the `FLEXFILENAMES'
         symbol, which indicates that the system supports
         filenames longer than 14 characters.

     `d_flock'
         From d_flock.U:

         This variable conditionally defines `HAS_FLOCK' if
         flock() is available to do file locking.

     `d_fork'
         From d_fork.U:

         This variable conditionally defines the `HAS_FORK'
         symbol, which indicates to the C program that the fork()
         routine is available.

     `d_fpathconf'
         From d_pathconf.U:

         This variable conditionally defines the `HAS_FPATHCONF'
         symbol, which indicates to the C program that the
         pathconf() routine is available to determine file-system
         related limits and options associated with a given open
         file descriptor.

     `d_fpos64_t'
         From d_fpos64_t.U:

         This symbol will be defined if the C compiler supports
         fpos64_t.

     `d_fs_data_s'
         From d_fs_data_s.U:

         This variable conditionally defines the
         `HAS_STRUCT_FS_DATA' symbol, which indicates that the
         struct fs_data is supported.

     `d_fseeko'
         From d_fseeko.U:

         This variable conditionally defines the `HAS_FSEEKO'
         symbol, which indicates to the C program that the
         fseeko() routine is available.

     `d_fsetpos'
         From d_fsetpos.U:

         This variable conditionally defines `HAS_FSETPOS' if
         fsetpos() is available to set the file position
         indicator.

     `d_fstatfs'
         From d_fstatfs.U:

         This variable conditionally defines the `HAS_FSTATFS'
         symbol, which indicates to the C program that the
         fstatfs() routine is available.

     `d_fstatvfs'
         From d_statvfs.U:

         This variable conditionally defines the `HAS_FSTATVFS'
         symbol, which indicates to the C program that the
         fstatvfs() routine is available.

     `d_ftello'
         From d_ftello.U:
         This variable conditionally defines the `HAS_FTELLO'
         symbol, which indicates to the C program that the
         ftello() routine is available.

     `d_ftime'
         From d_ftime.U:

         This variable conditionally defines the `HAS_FTIME'
         symbol, which indicates that the ftime() routine exists.
         The ftime() routine is basically a sub-second accuracy
         clock.

     `d_Gconvert'
         From d_gconvert.U:

         This variable holds what Gconvert is defined as to
         convert floating point numbers into strings. It could be
         `gconvert' or a more `complex' macro emulating gconvert
         with gcvt() or sprintf.  Possible values are:
         d_Gconvert=`gconvert((x),(n),(t),(b))'
         d_Gconvert=`gcvt((x),(n),(b))'
         d_Gconvert=`sprintf((b),%.*g,(n),(x))'

     `d_getcwd'
         From d_getcwd.U:

         This variable conditionally defines the `HAS_GETCWD'
         symbol, which indicates to the C program that the
         getcwd() routine is available to get the current working
         directory.

     `d_getfsstat'
         From d_getfsstat.U:

         This variable conditionally defines the `HAS_GETFSSTAT'
         symbol, which indicates to the C program that the
         getfsstat() routine is available.

     `d_getgrent'
         From d_getgrent.U:

         This variable conditionally defines the `HAS_GETGRENT'
         symbol, which indicates to the C program that the
         getgrent() routine is available for sequential access of
         the group database.

     `d_getgrps'
         From d_getgrps.U:

         This variable conditionally defines the `HAS_GETGROUPS'
         symbol, which indicates to the C program that the
         getgroups() routine is available to get the list of
         process groups.

     `d_gethbyaddr'
         From d_gethbyad.U:

         This variable conditionally defines the
         `HAS_GETHOSTBYADDR' symbol, which indicates to the C
         program that the gethostbyaddr() routine is available to
         look up hosts by their `IP' addresses.

     `d_gethbyname'
         From d_gethbynm.U:

         This variable conditionally defines the
         `HAS_GETHOSTBYNAME' symbol, which indicates to the C
         program that the gethostbyname() routine is available to
         look up host names in some data base or other.

     `d_gethent'
         From d_gethent.U:

         This variable conditionally defines `HAS_GETHOSTENT' if
         gethostent() is available to look up host names in some
         data base or another.

     `d_gethname'
         From d_gethname.U:

         This variable conditionally defines the
         `HAS_GETHOSTNAME' symbol, which indicates to the C
         program that the gethostname() routine may be used to
         derive the host name.

     `d_gethostprotos'
         From d_gethostprotos.U:

         This variable conditionally defines the
         `HAS_GETHOST_PROTOS' symbol, which indicates to the C
         program that <netdb.h> supplies prototypes for the
         various gethost*() functions. See also netdbtype.U for
         probing for various netdb types.

     `d_getlogin'
         From d_getlogin.U:

         This variable conditionally defines the `HAS_GETLOGIN'
         symbol, which indicates to the C program that the
         getlogin() routine is available to get the login name.

     `d_getmnt'
         From d_getmnt.U:

         This variable conditionally defines the `HAS_GETMNT'
         symbol, which indicates to the C program that the
         getmnt() routine is available to retrieve one or more
         mount info blocks by filename.

     `d_getmntent'
         From d_getmntent.U:

         This variable conditionally defines the `HAS_GETMNTENT'
         symbol, which indicates to the C program that the
         getmntent() routine is available to iterate through
         mounted files to get their mount info.

     `d_getnbyaddr'
         From d_getnbyad.U:

         This variable conditionally defines the
         `HAS_GETNETBYADDR' symbol, which indicates to the C
         program that the getnetbyaddr() routine is available to
         look up networks by their `IP' addresses.

     `d_getnbyname'
         From d_getnbynm.U:

         This variable conditionally defines the
         `HAS_GETNETBYNAME' symbol, which indicates to the C
         program that the getnetbyname() routine is available to
         look up networks by their names.

     `d_getnent'
         From d_getnent.U:

         This variable conditionally defines `HAS_GETNETENT' if
         getnetent() is available to look up network names in
         some data base or another.

     `d_getnetprotos'
         From d_getnetprotos.U:

         This variable conditionally defines the
         `HAS_GETNET_PROTOS' symbol, which indicates to the C
         program that <netdb.h> supplies prototypes for the
         various getnet*() functions. See also netdbtype.U for
         probing for various netdb types.

     `d_getpbyname'
         From d_getprotby.U:

         This variable conditionally defines the
         `HAS_GETPROTOBYNAME' symbol, which indicates to the C
         program that the getprotobyname() routine is available
         to look up protocols by their name.

     `d_getpbynumber'
         From d_getprotby.U:

         This variable conditionally defines the
         `HAS_GETPROTOBYNUMBER' symbol, which indicates to the C
         program that the getprotobynumber() routine is available
         to look up protocols by their number.

     `d_getpent'
         From d_getpent.U:

         This variable conditionally defines `HAS_GETPROTOENT' if
         getprotoent() is available to look up protocols in some
         data base or another.

     `d_getpgid'
         From d_getpgid.U:

         This variable conditionally defines the `HAS_GETPGID'
         symbol, which indicates to the C program that the
         getpgid(pid) function is available to get the process
         group id.

     `d_getpgrp2'
         From d_getpgrp2.U:

         This variable conditionally defines the HAS_GETPGRP2
         symbol, which indicates to the C program that the
         getpgrp2() (as in DG/`UX') routine is available to get
         the current process group.

     `d_getpgrp'
         From d_getpgrp.U:

         This variable conditionally defines `HAS_GETPGRP' if
         getpgrp() is available to get the current process group.

     `d_getppid'
         From d_getppid.U:

         This variable conditionally defines the `HAS_GETPPID'
         symbol, which indicates to the C program that the
         getppid() routine is available to get the parent process
         `ID'.

     `d_getprior'
         From d_getprior.U:

         This variable conditionally defines `HAS_GETPRIORITY' if
         getpriority() is available to get a process's priority.


     `d_getprotoprotos'
         From d_getprotoprotos.U:

         This variable conditionally defines the
         `HAS_GETPROTO_PROTOS' symbol, which indicates to the C
         program that <netdb.h> supplies prototypes for the
         various getproto*() functions. See also netdbtype.U for
         probing for various netdb types.

     `d_getpwent'
         From d_getpwent.U:

         This variable conditionally defines the `HAS_GETPWENT'
         symbol, which indicates to the C program that the
         getpwent() routine is available for sequential access of
         the passwd database.

     `d_getsbyname'
         From d_getsrvby.U:

         This variable conditionally defines the
         `HAS_GETSERVBYNAME' symbol, which indicates to the C
         program that the getservbyname() routine is available to
         look up services by their name.

     `d_getsbyport'
         From d_getsrvby.U:

         This variable conditionally defines the
         `HAS_GETSERVBYPORT' symbol, which indicates to the C
         program that the getservbyport() routine is available to
         look up services by their port.

     `d_getsent'
         From d_getsent.U:

         This variable conditionally defines `HAS_GETSERVENT' if
         getservent() is available to look up network services in
         some data base or another.

     `d_getservprotos'
         From d_getservprotos.U:

         This variable conditionally defines the
         `HAS_GETSERV_PROTOS' symbol, which indicates to the C
         program that <netdb.h> supplies prototypes for the
         various getserv*() functions. See also netdbtype.U for
         probing for various netdb types.

     `d_getspent'
         From d_getspent.U:

         This variable conditionally defines `HAS_GETSPENT' if
         getspent() is available to retrieve SysV shadow password
         entries sequentially.

     `d_getspnam'
         From d_getspnam.U:

         This variable conditionally defines `HAS_GETSPNAM' if
         getspnam() is available to retrieve SysV shadow password
         entries by name.

     `d_gettimeod'
         From d_ftime.U:

         This variable conditionally defines the
         `HAS_GETTIMEOFDAY' symbol, which indicates that the
         gettimeofday() system call exists (to obtain a sub-
         second accuracy clock). You should probably include
         <sys/resource.h>.

     `d_gnulibc'
         From d_gnulibc.U:

         Defined if we're dealing with the `GNU' C Library.

     `d_grpasswd'
         From i_grp.U:

         This variable conditionally defines `GRPASSWD', which
         indicates that struct group in <grp.h> contains
         gr_passwd.

     `d_hasmntopt'
         From d_hasmntopt.U:

         This variable conditionally defines the `HAS_HASMNTOPT'
         symbol, which indicates to the C program that the
         hasmntopt() routine is available to query the mount
         options of file systems.

     `d_htonl'
         From d_htonl.U:

         This variable conditionally defines `HAS_HTONL' if
         htonl() and its friends are available to do network
         order byte swapping.

     `d_iconv'
         From d_iconv.U:

         This variable conditionally defines the `HAS_ICONV'
         symbol, which indicates to the C program that the
         iconv() routine is available.

     `d_index'
         From d_strchr.U:

         This variable conditionally defines `HAS_INDEX' if
         index() and rindex() are available for string searching.

     `d_inetaton'
         From d_inetaton.U:

         This variable conditionally defines the `HAS_INET_ATON'
         symbol, which indicates to the C program that the
         inet_aton() function is available to parse `IP' address
         `dotted-quad' strings.

     `d_int64_t'
         From d_int64_t.U:

         This symbol will be defined if the C compiler supports
         int64_t.

     `d_isascii'
         From d_isascii.U:

         This variable conditionally defines the `HAS_ISASCII'
         constant, which indicates to the C program that
         isascii() is available.

     `d_killpg'
         From d_killpg.U:

         This variable conditionally defines the `HAS_KILLPG'
         symbol, which indicates to the C program that the
         killpg() routine is available to kill process groups.

     `d_lchown'
         From d_lchown.U:

         This variable conditionally defines the `HAS_LCHOWN'
         symbol, which indicates to the C program that the
         lchown() routine is available to operate on a symbolic
         link (instead of following the link).

     `d_ldbl_dig'
         From d_ldbl_dig.U:

         This variable conditionally defines d_ldbl_dig if this
         system's header files provide `LDBL_DIG', which is the
         number of significant digits in a long double precision
         number.

     `d_link'
         From d_link.U:

         This variable conditionally defines `HAS_LINK' if link()
         is available to create hard links.

     `d_locconv'
         From d_locconv.U:

         This variable conditionally defines `HAS_LOCALECONV' if
         localeconv() is available for numeric and monetary
         formatting conventions.

     `d_lockf'
         From d_lockf.U:

         This variable conditionally defines `HAS_LOCKF' if
         lockf() is available to do file locking.

     `d_longdbl'
         From d_longdbl.U:

         This variable conditionally defines `HAS_LONG_DOUBLE' if
         the long double type is supported.

     `d_longlong'
         From d_longlong.U:

         This variable conditionally defines `HAS_LONG_LONG' if
         the long long type is supported.

     `d_lseekproto'
         From d_lseekproto.U:

         This variable conditionally defines the
         `HAS_LSEEK_PROTO' symbol, which indicates to the C
         program that the system provides a prototype for the
         lseek() function.  Otherwise, it is up to the program to
         supply one.

     `d_lstat'
         From d_lstat.U:

         This variable conditionally defines `HAS_LSTAT' if
         lstat() is available to do file stats on symbolic links.

     `d_madvise'
         From d_madvise.U:

         This variable conditionally defines `HAS_MADVISE' if
         madvise() is available to map a file into memory.

     `d_mblen'
         From d_mblen.U:

         This variable conditionally defines the `HAS_MBLEN'
         symbol, which indicates to the C program that the
         mblen() routine is available to find the number of bytes
         in a multibye character.

     `d_mbstowcs'
         From d_mbstowcs.U:

         This variable conditionally defines the `HAS_MBSTOWCS'
         symbol, which indicates to the C program that the
         mbstowcs() routine is available to convert a multibyte
         string into a wide character string.

     `d_mbtowc'
         From d_mbtowc.U:

         This variable conditionally defines the `HAS_MBTOWC'
         symbol, which indicates to the C program that the
         mbtowc() routine is available to convert multibyte to a
         wide character.

     `d_memchr'
         From d_memchr.U:

         This variable conditionally defines the `HAS_MEMCHR'
         symbol, which indicates to the C program that the
         memchr() routine is available to locate characters
         within a C string.

     `d_memcmp'
         From d_memcmp.U:

         This variable conditionally defines the `HAS_MEMCMP'
         symbol, which indicates to the C program that the
         memcmp() routine is available to compare blocks of
         memory.

     `d_memcpy'
         From d_memcpy.U:

         This variable conditionally defines the `HAS_MEMCPY'
         symbol, which indicates to the C program that the
         memcpy() routine is available to copy blocks of memory.

     `d_memmove'
         From d_memmove.U:

         This variable conditionally defines the `HAS_MEMMOVE'
         symbol, which indicates to the C program that the
         memmove() routine is available to copy potentatially
         overlapping blocks of memory.

     `d_memset'
         From d_memset.U:

         This variable conditionally defines the `HAS_MEMSET'
         symbol, which indicates to the C program that the
         memset() routine is available to set blocks of memory.

     `d_mkdir'
         From d_mkdir.U:

         This variable conditionally defines the `HAS_MKDIR'
         symbol, which indicates to the C program that the
         mkdir() routine is available to create directories..

     `d_mkdtemp'
         From d_mkdtemp.U:

         This variable conditionally defines the `HAS_MKDTEMP'
         symbol, which indicates to the C program that the
         mkdtemp() routine is available to exclusively create a
         uniquely named temporary directory.

     `d_mkfifo'
         From d_mkfifo.U:

         This variable conditionally defines the `HAS_MKFIFO'
         symbol, which indicates to the C program that the
         mkfifo() routine is available.

     `d_mkstemp'
         From d_mkstemp.U:

         This variable conditionally defines the `HAS_MKSTEMP'
         symbol, which indicates to the C program that the
         mkstemp() routine is available to exclusively create and
         open a uniquely named temporary file.

     `d_mkstemps'
         From d_mkstemps.U:

         This variable conditionally defines the `HAS_MKSTEMPS'
         symbol, which indicates to the C program that the
         mkstemps() routine is available to exclusively create
         and open a uniquely named (with a suffix) temporary
         file.

     `d_mktime'
         From d_mktime.U:

         This variable conditionally defines the `HAS_MKTIME'
         symbol, which indicates to the C program that the
         mktime() routine is available.

     `d_mmap'
         From d_mmap.U:

         This variable conditionally defines `HAS_MMAP' if mmap()
         is available to map a file into memory.

     `d_mprotect'
         From d_mprotect.U:

         This variable conditionally defines `HAS_MPROTECT' if
         mprotect() is available to modify the access protection
         of a memory mapped file.

     `d_msg'
         From d_msg.U:

         This variable conditionally defines the `HAS_MSG'
         symbol, which indicates that the entire msg*(2) library
         is present.

     `d_msg_ctrunc'
         From d_socket.U:

         This variable conditionally defines the `HAS_MSG_CTRUNC'
         symbol, which indicates that the `MSG_CTRUNC' is
         available.  #ifdef is not enough because it may be an
         enum, glibc has been known to do this.

     `d_msg_dontroute'
         From d_socket.U:

         This variable conditionally defines the
         `HAS_MSG_DONTROUTE' symbol, which indicates that the
         `MSG_DONTROUTE' is available.  #ifdef is not enough
         because it may be an enum, glibc has been known to do
         this.

     `d_msg_oob'
         From d_socket.U:

         This variable conditionally defines the `HAS_MSG_OOB'
         symbol, which indicates that the `MSG_OOB' is available.
         #ifdef is not enough because it may be an enum, glibc
         has been known to do this.

     `d_msg_peek'
         From d_socket.U:

         This variable conditionally defines the `HAS_MSG_PEEK'
         symbol, which indicates that the `MSG_PEEK' is
         available.  #ifdef is not enough because it may be an
         enum, glibc has been known to do this.

     `d_msg_proxy'
         From d_socket.U:

         This variable conditionally defines the `HAS_MSG_PROXY'
         symbol, which indicates that the `MSG_PROXY' is
         available.  #ifdef is not enough because it may be an
         enum, glibc has been known to do this.

     `d_msgctl'
         From d_msgctl.U:

         This variable conditionally defines the `HAS_MSGCTL'
         symbol, which indicates to the C program that the
         msgctl() routine is available.

     `d_msgget'
         From d_msgget.U:

         This variable conditionally defines the `HAS_MSGGET'
         symbol, which indicates to the C program that the
         msgget() routine is available.

     `d_msgrcv'
         From d_msgrcv.U:

         This variable conditionally defines the `HAS_MSGRCV'
         symbol, which indicates to the C program that the
         msgrcv() routine is available.

     `d_msgsnd'
         From d_msgsnd.U:

         This variable conditionally defines the `HAS_MSGSND'
         symbol, which indicates to the C program that the
         msgsnd() routine is available.

     `d_msync'
         From d_msync.U:

         This variable conditionally defines `HAS_MSYNC' if
         msync() is available to synchronize a mapped file.

     `d_munmap'
         From d_munmap.U:

         This variable conditionally defines `HAS_MUNMAP' if
         munmap() is available to unmap a region mapped by
         mmap().

     `d_mymalloc'
         From mallocsrc.U:

         This variable conditionally defines `MYMALLOC' in case
         other parts of the source want to take special action if
         `MYMALLOC' is used.  This may include different sorts of
         profiling or error detection.

     `d_nice'
         From d_nice.U:

         This variable conditionally defines the `HAS_NICE'
         symbol, which indicates to the C program that the nice()
         routine is available.

     `d_nv_preserves_uv'
         From perlxv.U:

         This variable indicates whether a variable of type
         nvtype can preserve all the bits a variable of type
         uvtype.

     `d_off64_t'
         From d_off64_t.U:

         This symbol will be defined if the C compiler supports
         off64_t.

     `d_old_pthread_create_joinable'
         From d_pthrattrj.U:

         This variable conditionally defines
         pthread_create_joinable.  undef if pthread.h defines
         `PTHREAD_CREATE_JOINABLE'.

     `d_oldpthreads'
         From usethreads.U:

         This variable conditionally defines the
         `OLD_PTHREADS_API' symbol, and indicates that Perl
         should be built to use the old draft `POSIX' threads
         `API'.  This is only potentially meaningful if
         usethreads is set.

     `d_oldsock'
         From d_socket.U:

         This variable conditionally defines the `OLDSOCKET'
         symbol, which indicates that the `BSD' socket interface
         is based on 4.1c and not 4.2.

     `d_open3'
         From d_open3.U:

         This variable conditionally defines the HAS_OPEN3
         manifest constant, which indicates to the C program that
         the 3 argument version of the open(2) function is
         available.

     `d_pathconf'
         From d_pathconf.U:

         This variable conditionally defines the `HAS_PATHCONF'
         symbol, which indicates to the C program that the
         pathconf() routine is available to determine file-system
         related limits and options associated with a given
         filename.

     `d_pause'
         From d_pause.U:

         This variable conditionally defines the `HAS_PAUSE'
         symbol, which indicates to the C program that the
         pause() routine is available to suspend a process until
         a signal is received.

     `d_phostname'
         From d_gethname.U:

         This variable conditionally defines the `HAS_PHOSTNAME'
         symbol, which contains the shell command which, when fed
         to popen(), may be used to derive the host name.

     `d_pipe'
         From d_pipe.U:

         This variable conditionally defines the `HAS_PIPE'
         symbol, which indicates to the C program that the pipe()
         routine is available to create an inter-process channel.

     `d_poll'
         From d_poll.U:

         This variable conditionally defines the `HAS_POLL'
         symbol, which indicates to the C program that the poll()
         routine is available to poll active file descriptors.

     `d_portable'
         From d_portable.U:

         This variable conditionally defines the `PORTABLE'
         symbol, which indicates to the C program that it should
         not assume that it is running on the machine it was
         compiled on.

     `d_PRId64'
         From quadfio.U:

         This variable conditionally defines the PERL_PRId64
         symbol, which indiciates that stdio has a symbol to
         print 64-bit decimal numbers.

     `d_PRIeldbl'
         From longdblfio.U:

         This variable conditionally defines the PERL_PRIfldlbl
         symbol, which indiciates that stdio has a symbol to
         print long doubles.

     `d_PRIEldbl'
         From longdblfio.U:

         This variable conditionally defines the PERL_PRIfldlbl
         symbol, which indiciates that stdio has a symbol to
         print long doubles.

     `d_PRIfldbl'
         From longdblfio.U:

         This variable conditionally defines the PERL_PRIfldlbl
         symbol, which indiciates that stdio has a symbol to
         print long doubles.

     `d_PRIFldbl'
         From longdblfio.U:

         This variable conditionally defines the PERL_PRIfldlbl
         symbol, which indiciates that stdio has a symbol to
         print long doubles.

     `d_PRIgldbl'
         From longdblfio.U:

         This variable conditionally defines the PERL_PRIfldlbl
         symbol, which indiciates that stdio has a symbol to
         print long doubles.

     `d_PRIGldbl'
         From longdblfio.U:

         This variable conditionally defines the PERL_PRIfldlbl
         symbol, which indiciates that stdio has a symbol to
         print long doubles.


     `d_PRIi64'
         From quadfio.U:

         This variable conditionally defines the PERL_PRIi64
         symbol, which indiciates that stdio has a symbol to
         print 64-bit decimal numbers.

     `d_PRIo64'
         From quadfio.U:

         This variable conditionally defines the PERL_PRIo64
         symbol, which indiciates that stdio has a symbol to
         print 64-bit octal numbers.

     `d_PRIu64'
         From quadfio.U:

         This variable conditionally defines the PERL_PRIu64
         symbol, which indiciates that stdio has a symbol to
         print 64-bit unsigned decimal numbers.

     `d_PRIx64'
         From quadfio.U:

         This variable conditionally defines the PERL_PRIx64
         symbol, which indiciates that stdio has a symbol to
         print 64-bit hexadecimal numbers.

     `d_PRIX64'
         From quadfio.U:

         This variable conditionally defines the PERL_PRIX64
         symbol, which indiciates that stdio has a symbol to
         print 64-bit hExADECimAl numbers.

     `d_pthread_yield'
         From d_pthread_y.U:

         This variable conditionally defines the
         `HAS_PTHREAD_YIELD' symbol if the pthread_yield routine
         is available to yield the execution of the current
         thread.

     `d_pwage'
         From i_pwd.U:

         This variable conditionally defines `PWAGE', which
         indicates that struct passwd contains pw_age.

     `d_pwchange'
         From i_pwd.U:

         This variable conditionally defines `PWCHANGE', which
         indicates that struct passwd contains pw_change.

     `d_pwclass'
         From i_pwd.U:

         This variable conditionally defines `PWCLASS', which
         indicates that struct passwd contains pw_class.

     `d_pwcomment'
         From i_pwd.U:

         This variable conditionally defines `PWCOMMENT', which
         indicates that struct passwd contains pw_comment.

     `d_pwexpire'
         From i_pwd.U:

         This variable conditionally defines `PWEXPIRE', which
         indicates that struct passwd contains pw_expire.

     `d_pwgecos'
         From i_pwd.U:

         This variable conditionally defines `PWGECOS', which
         indicates that struct passwd contains pw_gecos.

     `d_pwpasswd'
         From i_pwd.U:

         This variable conditionally defines `PWPASSWD', which
         indicates that struct passwd contains pw_passwd.

     `d_pwquota'
         From i_pwd.U:

         This variable conditionally defines `PWQUOTA', which
         indicates that struct passwd contains pw_quota.

     `d_qgcvt'
         From d_qgcvt.U:

         This variable conditionally defines the `HAS_QGCVT'
         symbol, which indicates to the C program that the
         qgcvt() routine is available.

     `d_quad'
         From quadtype.U:

         This variable, if defined, tells that there's a 64-bit
         integer type, quadtype.

     `d_readdir'
         From d_readdir.U:

         This variable conditionally defines `HAS_READDIR' if
         readdir() is available to read directory entries.

     `d_readlink'
         From d_readlink.U:

         This variable conditionally defines the `HAS_READLINK'
         symbol, which indicates to the C program that the
         readlink() routine is available to read the value of a
         symbolic link.

     `d_rename'
         From d_rename.U:

         This variable conditionally defines the `HAS_RENAME'
         symbol, which indicates to the C program that the
         rename() routine is available to rename files.

     `d_rewinddir'
         From d_readdir.U:

         This variable conditionally defines `HAS_REWINDDIR' if
         rewinddir() is available.

     `d_rmdir'
         From d_rmdir.U:

         This variable conditionally defines `HAS_RMDIR' if
         rmdir() is available to remove directories.

     `d_safebcpy'
         From d_safebcpy.U:

         This variable conditionally defines the `HAS_SAFE_BCOPY'
         symbol if the bcopy() routine can do overlapping copies.

     `d_safemcpy'
         From d_safemcpy.U:

         This variable conditionally defines the
         `HAS_SAFE_MEMCPY' symbol if the memcpy() routine can do
         overlapping copies.

     `d_sanemcmp'
         From d_sanemcmp.U:

         This variable conditionally defines the
         `HAS_SANE_MEMCMP' symbol if the memcpy() routine is
         available and can be used to compare relative magnitudes
         of chars with their high bits set.

     `d_sched_yield'
         From d_pthread_y.U:

         This variable conditionally defines the
         `HAS_SCHED_YIELD' symbol if the sched_yield routine is
         available to yield the execution of the current thread.

     `d_scm_rights'
         From d_socket.U:

         This variable conditionally defines the `HAS_SCM_RIGHTS'
         symbol, which indicates that the `SCM_RIGHTS' is
         available.  #ifdef is not enough because it may be an
         enum, glibc has been known to do this.

     `d_seekdir'
         From d_readdir.U:

         This variable conditionally defines `HAS_SEEKDIR' if
         seekdir() is available.

     `d_select'
         From d_select.U:

         This variable conditionally defines `HAS_SELECT' if
         select() is available to select active file descriptors.
         A <sys/time.h> inclusion may be necessary for the
         timeout field.

     `d_sem'
         From d_sem.U:

         This variable conditionally defines the `HAS_SEM'
         symbol, which indicates that the entire sem*(2) library
         is present.

     `d_semctl'
         From d_semctl.U:

         This variable conditionally defines the `HAS_SEMCTL'
         symbol, which indicates to the C program that the
         semctl() routine is available.

     `d_semctl_semid_ds'
         From d_union_semun.U:

         This variable conditionally defines
         `USE_SEMCTL_SEMID_DS', which indicates that struct
         semid_ds * is to be used for semctl `IPC_STAT'.

     `d_semctl_semun'
         From d_union_semun.U:

         This variable conditionally defines `USE_SEMCTL_SEMUN',
         which indicates that union semun is to be used for
         semctl `IPC_STAT'.

     `d_semget'
         From d_semget.U:

         This variable conditionally defines the `HAS_SEMGET'
         symbol, which indicates to the C program that the
         semget() routine is available.

     `d_semop'
         From d_semop.U:

         This variable conditionally defines the `HAS_SEMOP'
         symbol, which indicates to the C program that the
         semop() routine is available.

     `d_setegid'
         From d_setegid.U:

         This variable conditionally defines the `HAS_SETEGID'
         symbol, which indicates to the C program that the
         setegid() routine is available to change the effective
         gid of the current program.

     `d_seteuid'
         From d_seteuid.U:

         This variable conditionally defines the `HAS_SETEUID'
         symbol, which indicates to the C program that the
         seteuid() routine is available to change the effective
         uid of the current program.

     `d_setgrent'
         From d_setgrent.U:

         This variable conditionally defines the `HAS_SETGRENT'
         symbol, which indicates to the C program that the
         setgrent() routine is available for initializing
         sequential access to the group database.

     `d_setgrps'
         From d_setgrps.U:

         This variable conditionally defines the `HAS_SETGROUPS'
         symbol, which indicates to the C program that the
         setgroups() routine is available to set the list of
         process groups.

     `d_sethent'
         From d_sethent.U:

         This variable conditionally defines `HAS_SETHOSTENT' if
         sethostent() is available.

     `d_setlinebuf'
         From d_setlnbuf.U:

         This variable conditionally defines the `HAS_SETLINEBUF'
         symbol, which indicates to the C program that the
         setlinebuf() routine is available to change stderr or
         stdout from block-buffered or unbuffered to a line-
         buffered mode.

     `d_setlocale'
         From d_setlocale.U:

         This variable conditionally defines `HAS_SETLOCALE' if
         setlocale() is available to handle locale-specific ctype
         implementations.

     `d_setnent'
         From d_setnent.U:

         This variable conditionally defines `HAS_SETNETENT' if
         setnetent() is available.

     `d_setpent'
         From d_setpent.U:

         This variable conditionally defines `HAS_SETPROTOENT' if
         setprotoent() is available.

     `d_setpgid'
         From d_setpgid.U:

         This variable conditionally defines the `HAS_SETPGID'
         symbol if the setpgid(pid, gpid) function is available
         to set process group `ID'.

     `d_setpgrp2'
         From d_setpgrp2.U:

         This variable conditionally defines the HAS_SETPGRP2
         symbol, which indicates to the C program that the
         setpgrp2() (as in DG/`UX') routine is available to set
         the current process group.

     `d_setpgrp'
         From d_setpgrp.U:

         This variable conditionally defines `HAS_SETPGRP' if
         setpgrp() is available to set the current process group.

     `d_setprior'
         From d_setprior.U:

         This variable conditionally defines `HAS_SETPRIORITY' if
         setpriority() is available to set a process's priority.

     `d_setpwent'
         From d_setpwent.U:

         This variable conditionally defines the `HAS_SETPWENT'
         symbol, which indicates to the C program that the
         setpwent() routine is available for initializing
         sequential access to the passwd database.

     `d_setregid'
         From d_setregid.U:

         This variable conditionally defines `HAS_SETREGID' if
         setregid() is available to change the real and effective
         gid of the current process.

     `d_setresgid'
         From d_setregid.U:

         This variable conditionally defines `HAS_SETRESGID' if
         setresgid() is available to change the real, effective
         and saved gid of the current process.

     `d_setresuid'
         From d_setreuid.U:

         This variable conditionally defines `HAS_SETREUID' if
         setresuid() is available to change the real, effective
         and saved uid of the current process.

     `d_setreuid'
         From d_setreuid.U:

         This variable conditionally defines `HAS_SETREUID' if
         setreuid() is available to change the real and effective
         uid of the current process.

     `d_setrgid'
         From d_setrgid.U:

         This variable conditionally defines the `HAS_SETRGID'
         symbol, which indicates to the C program that the
         setrgid() routine is available to change the real gid of
         the current program.

     `d_setruid'
         From d_setruid.U:

         This variable conditionally defines the `HAS_SETRUID'
         symbol, which indicates to the C program that the
         setruid() routine is available to change the real uid of
         the current program.

     `d_setsent'
         From d_setsent.U:

         This variable conditionally defines `HAS_SETSERVENT' if
         setservent() is available.

     `d_setsid'
         From d_setsid.U:

         This variable conditionally defines `HAS_SETSID' if
         setsid() is available to set the process group `ID'.

     `d_setspent'
         From d_setspent.U:

         This variable conditionally defines `HAS_SETSPENT' if
         setspent() is available to initialize the scan of SysV
         shadow password entries.

     `d_setvbuf'
         From d_setvbuf.U:

         This variable conditionally defines the `HAS_SETVBUF'
         symbol, which indicates to the C program that the
         setvbuf() routine is available to change buffering on an
         open stdio stream.

     `d_sfio'
         From d_sfio.U:

         This variable conditionally defines the `USE_SFIO'
         symbol, and indicates whether sfio is available (and
         should be used).

     `d_shm'
         From d_shm.U:

         This variable conditionally defines the `HAS_SHM'
         symbol, which indicates that the entire shm*(2) library
         is present.

     `d_shmat'
         From d_shmat.U:

         This variable conditionally defines the `HAS_SHMAT'
         symbol, which indicates to the C program that the
         shmat() routine is available.

     `d_shmatprototype'
         From d_shmat.U:

         This variable conditionally defines the
         `HAS_SHMAT_PROTOTYPE' symbol, which indicates that
         sys/shm.h has a prototype for shmat.

     `d_shmctl'
         From d_shmctl.U:

         This variable conditionally defines the `HAS_SHMCTL'
         symbol, which indicates to the C program that the
         shmctl() routine is available.

     `d_shmdt'
         From d_shmdt.U:

         This variable conditionally defines the `HAS_SHMDT'
         symbol, which indicates to the C program that the
         shmdt() routine is available.

     `d_shmget'
         From d_shmget.U:

         This variable conditionally defines the `HAS_SHMGET'
         symbol, which indicates to the C program that the
         shmget() routine is available.

     `d_sigaction'
         From d_sigaction.U:

         This variable conditionally defines the `HAS_SIGACTION'
         symbol, which indicates that the Vr4 sigaction() routine
         is available.

     `d_sigsetjmp'
         From d_sigsetjmp.U:

         This variable conditionally defines the `HAS_SIGSETJMP'
         symbol, which indicates that the sigsetjmp() routine is
         available to call setjmp() and optionally save the
         process's signal mask.

     `d_socket'
         From d_socket.U:

         This variable conditionally defines `HAS_SOCKET', which
         indicates that the `BSD' socket interface is supported.

     `d_socklen_t'
         From d_socklen_t.U:

         This symbol will be defined if the C compiler supports
         socklen_t.

     `d_sockpair'
         From d_socket.U:

         This variable conditionally defines the `HAS_SOCKETPAIR'
         symbol, which indicates that the `BSD' socketpair() is
         supported.

     `d_sqrtl'
         From d_sqrtl.U:

         This variable conditionally defines the `HAS_SQRTL'
         symbol, which indicates to the C program that the
         sqrtl() routine is available.

     `d_statblks'
         From d_statblks.U:

         This variable conditionally defines `USE_STAT_BLOCKS' if
         this system has a stat structure declaring st_blksize
         and st_blocks.

     `d_statfs_f_flags'
         From d_statfs_f_flags.U:

         This variable conditionally defines the
         `HAS_STRUCT_STATFS_F_FLAGS' symbol, which indicates to
         struct statfs from has f_flags member.  This kind of
         struct statfs is coming from sys/mount.h (`BSD'), not
         from sys/statfs.h (`SYSV').

     `d_statfs_s'
         From d_statfs_s.U:

         This variable conditionally defines the
         `HAS_STRUCT_STATFS' symbol, which indicates that the
         struct statfs is supported.

     `d_statvfs'
         From d_statvfs.U:

         This variable conditionally defines the `HAS_STATVFS'
         symbol, which indicates to the C program that the
         statvfs() routine is available.

     `d_stdio_cnt_lval'
         From d_stdstdio.U:
         This variable conditionally defines `STDIO_CNT_LVALUE'
         if the `FILE_cnt' macro can be used as an lvalue.

     `d_stdio_ptr_lval'
         From d_stdstdio.U:

         This variable conditionally defines `STDIO_PTR_LVALUE'
         if the `FILE_ptr' macro can be used as an lvalue.

     `d_stdio_stream_array'
         From stdio_streams.U:

         This variable tells whether there is an array holding
         the stdio streams.

     `d_stdiobase'
         From d_stdstdio.U:

         This variable conditionally defines `USE_STDIO_BASE' if
         this system has a `FILE' structure declaring a usable
         _base field (or equivalent) in stdio.h.

     `d_stdstdio'
         From d_stdstdio.U:

         This variable conditionally defines `USE_STDIO_PTR' if
         this system has a `FILE' structure declaring usable _ptr
         and _cnt fields (or equivalent) in stdio.h.

     `d_strchr'
         From d_strchr.U:

         This variable conditionally defines `HAS_STRCHR' if
         strchr() and strrchr() are available for string
         searching.

     `d_strcoll'
         From d_strcoll.U:

         This variable conditionally defines `HAS_STRCOLL' if
         strcoll() is available to compare strings using
         collating information.

     `d_strctcpy'
         From d_strctcpy.U:

         This variable conditionally defines the
         `USE_STRUCT_COPY' symbol, which indicates to the C
         program that this C compiler knows how to copy
         structures.


     `d_strerrm'
         From d_strerror.U:

         This variable holds what Strerrr is defined as to
         translate an error code condition into an error message
         string. It could be `strerror' or a more `complex' macro
         emulating strrror with sys_errlist[], or the `unknown'
         string when both strerror and sys_errlist are missing.

     `d_strerror'
         From d_strerror.U:

         This variable conditionally defines `HAS_STRERROR' if
         strerror() is available to translate error numbers to
         strings.

     `d_strtod'
         From d_strtod.U:

         This variable conditionally defines the `HAS_STRTOD'
         symbol, which indicates to the C program that the
         strtod() routine is available to provide better numeric
         string conversion than atof().

     `d_strtol'
         From d_strtol.U:

         This variable conditionally defines the `HAS_STRTOL'
         symbol, which indicates to the C program that the
         strtol() routine is available to provide better numeric
         string conversion than atoi() and friends.

     `d_strtold'
         From d_strtold.U:

         This variable conditionally defines the `HAS_STRTOLD'
         symbol, which indicates to the C program that the
         strtold() routine is available.

     `d_strtoll'
         From d_strtoll.U:

         This variable conditionally defines the `HAS_STRTOLL'
         symbol, which indicates to the C program that the
         strtoll() routine is available.

     `d_strtoul'
         From d_strtoul.U:

         This variable conditionally defines the `HAS_STRTOUL'
         symbol, which indicates to the C program that the
         strtoul() routine is available to provide conversion of
         strings to unsigned long.

     `d_strtoull'
         From d_strtoull.U:

         This variable conditionally defines the `HAS_STRTOULL'
         symbol, which indicates to the C program that the
         strtoull() routine is available.

     `d_strtouq'
         From d_strtouq.U:

         This variable conditionally defines the `HAS_STRTOUQ'
         symbol, which indicates to the C program that the
         strtouq() routine is available.

     `d_strxfrm'
         From d_strxfrm.U:

         This variable conditionally defines `HAS_STRXFRM' if
         strxfrm() is available to transform strings.

     `d_suidsafe'
         From d_dosuid.U:

         This variable conditionally defines
         `SETUID_SCRIPTS_ARE_SECURE_NOW' if setuid scripts can be
         secure.  This test looks in /dev/fd/.

     `d_symlink'
         From d_symlink.U:

         This variable conditionally defines the `HAS_SYMLINK'
         symbol, which indicates to the C program that the
         symlink() routine is available to create symbolic links.

     `d_syscall'
         From d_syscall.U:

         This variable conditionally defines `HAS_SYSCALL' if
         syscall() is available call arbitrary system calls.

     `d_sysconf'
         From d_sysconf.U:

         This variable conditionally defines the `HAS_SYSCONF'
         symbol, which indicates to the C program that the
         sysconf() routine is available to determine system
         related limits and options.

     `d_sysernlst'
         From d_strerror.U:
         This variable conditionally defines `HAS_SYS_ERRNOLIST'
         if sys_errnolist[] is available to translate error
         numbers to the symbolic name.

     `d_syserrlst'
         From d_strerror.U:

         This variable conditionally defines `HAS_SYS_ERRLIST' if
         sys_errlist[] is available to translate error numbers to
         strings.

     `d_system'
         From d_system.U:

         This variable conditionally defines `HAS_SYSTEM' if
         system() is available to issue a shell command.

     `d_tcgetpgrp'
         From d_tcgtpgrp.U:

         This variable conditionally defines the `HAS_TCGETPGRP'
         symbol, which indicates to the C program that the
         tcgetpgrp() routine is available.  to get foreground
         process group `ID'.

     `d_tcsetpgrp'
         From d_tcstpgrp.U:

         This variable conditionally defines the `HAS_TCSETPGRP'
         symbol, which indicates to the C program that the
         tcsetpgrp() routine is available to set foreground
         process group `ID'.

     `d_telldir'
         From d_readdir.U:

         This variable conditionally defines `HAS_TELLDIR' if
         telldir() is available.

     `d_telldirproto'
         From d_telldirproto.U:

         This variable conditionally defines the
         `HAS_TELLDIR_PROTO' symbol, which indicates to the C
         program that the system provides a prototype for the
         telldir() function.  Otherwise, it is up to the program
         to supply one.

     `d_time'
         From d_time.U:

         This variable conditionally defines the `HAS_TIME'
         symbol, which indicates that the time() routine exists.
         The time() routine is normaly provided on `UNIX'
         systems.

     `d_times'
         From d_times.U:

         This variable conditionally defines the `HAS_TIMES'
         symbol, which indicates that the times() routine exists.
         The times() routine is normaly provided on `UNIX'
         systems. You may have to include <sys/times.h>.

     `d_truncate'
         From d_truncate.U:

         This variable conditionally defines `HAS_TRUNCATE' if
         truncate() is available to truncate files.

     `d_tzname'
         From d_tzname.U:

         This variable conditionally defines `HAS_TZNAME' if
         tzname[] is available to access timezone names.

     `d_umask'
         From d_umask.U:

         This variable conditionally defines the `HAS_UMASK'
         symbol, which indicates to the C program that the
         umask() routine is available.  to set and get the value
         of the file creation mask.

     `d_uname'
         From d_gethname.U:

         This variable conditionally defines the `HAS_UNAME'
         symbol, which indicates to the C program that the
         uname() routine may be used to derive the host name.

     `d_union_semun'
         From d_union_semun.U:

         This variable conditionally defines `HAS_UNION_SEMUN' if
         the union semun is defined by including <sys/sem.h>.

     `d_ustat'
         From d_ustat.U:

         This variable conditionally defines `HAS_USTAT' if
         ustat() is available to query file system statistics by
         dev_t.

     `d_vendorarch'
         From vendorarch.U:

         This variable conditionally defined `PERL_VENDORARCH'.

     `d_vendorbin'
         From vendorbin.U:

         This variable conditionally defines `PERL_VENDORBIN'.

     `d_vendorlib'
         From vendorlib.U:

         This variable conditionally defines `PERL_VENDORLIB'.

     `d_vfork'
         From d_vfork.U:

         This variable conditionally defines the `HAS_VFORK'
         symbol, which indicates the vfork() routine is
         available.

     `d_void_closedir'
         From d_closedir.U:

         This variable conditionally defines `VOID_CLOSEDIR' if
         closedir() does not return a value.

     `d_voidsig'
         From d_voidsig.U:

         This variable conditionally defines `VOIDSIG' if this
         system declares "void (*signal(...))()" in signal.h.
         The old way was to declare it as "int (*signal(...))()".

     `d_voidtty'
         From i_sysioctl.U:

         This variable conditionally defines `USE_IOCNOTTY' to
         indicate that the ioctl() call with `TIOCNOTTY' should
         be used to void tty association.  Otherwise (on `USG'
         probably), it is enough to close the standard file
         decriptors and do a setpgrp().

     `d_volatile'
         From d_volatile.U:

         This variable conditionally defines the `HASVOLATILE'
         symbol, which indicates to the C program that this C
         compiler knows about the volatile declaration.


     `d_vprintf'
         From d_vprintf.U:

         This variable conditionally defines the `HAS_VPRINTF'
         symbol, which indicates to the C program that the
         vprintf() routine is available to printf with a pointer
         to an argument list.

     `d_wait4'
         From d_wait4.U:

         This variable conditionally defines the HAS_WAIT4
         symbol, which indicates the wait4() routine is
         available.

     `d_waitpid'
         From d_waitpid.U:

         This variable conditionally defines `HAS_WAITPID' if
         waitpid() is available to wait for child process.

     `d_wcstombs'
         From d_wcstombs.U:

         This variable conditionally defines the `HAS_WCSTOMBS'
         symbol, which indicates to the C program that the
         wcstombs() routine is available to convert wide
         character strings to multibyte strings.

     `d_wctomb'
         From d_wctomb.U:

         This variable conditionally defines the `HAS_WCTOMB'
         symbol, which indicates to the C program that the
         wctomb() routine is available to convert a wide
         character to a multibyte.

     `d_xenix'
         From Guess.U:

         This variable conditionally defines the symbol `XENIX',
         which alerts the C program that it runs under Xenix.

     `date'
         From Loc.U:

         This variable is used internally by Configure to
         determine the full pathname (if any) of the date
         program.  After Configure runs, the value is reset to a
         plain `date' and is not useful.


     `db_hashtype'
         From i_db.U:

         This variable contains the type of the hash structure
         element in the <db.h> header file.  In older versions of
         `DB', it was int, while in newer ones it is u_int32_t.

     `db_prefixtype'
         From i_db.U:

         This variable contains the type of the prefix structure
         element in the <db.h> header file.  In older versions of
         `DB', it was int, while in newer ones it is size_t.

     `defvoidused'
         From voidflags.U:

         This variable contains the default value of the
         `VOIDUSED' symbol (15).

     `direntrytype'
         From i_dirent.U:

         This symbol is set to `struct direct' or `struct dirent'
         depending on whether dirent is available or not. You
         should use this pseudo type to portably declare your
         directory entries.

     `dlext'
         From dlext.U:

         This variable contains the extension that is to be used
         for the dynamically loaded modules that perl generaties.

     `dlsrc'
         From dlsrc.U:

         This variable contains the name of the dynamic loading
         file that will be used with the package.

     `doublesize'
         From doublesize.U:

         This variable contains the value of the `DOUBLESIZE'
         symbol, which indicates to the C program how many bytes
         there are in a double.

     `drand01'
         From randfunc.U:

         Indicates the macro to be used to generate normalized
         random numbers.  Uses randfunc, often divided by
         (double) (((unsigned long) 1 << randbits)) in order to
         normalize the result.  In C programs, the macro
         `Drand01' is mapped to drand01.

     `dynamic_ext'
         From Extensions.U:

         This variable holds a list of `XS' extension files we
         want to link dynamically into the package.  It is used
         by Makefile.

     e

     `eagain'
         From nblock_io.U:

         This variable bears the symbolic errno code set by
         read() when no data is present on the file and non-
         blocking I/O was enabled (otherwise, read() blocks
         naturally).

     `ebcdic'
         From ebcdic.U:

         This variable conditionally defines `EBCDIC' if this
         system uses `EBCDIC' encoding.  Among other things, this
         means that the character ranges are not contiguous.  See
         trnl.U

     `echo'
         From Loc.U:

         This variable is used internally by Configure to
         determine the full pathname (if any) of the echo
         program.  After Configure runs, the value is reset to a
         plain `echo' and is not useful.

     `egrep'
         From Loc.U:

         This variable is used internally by Configure to
         determine the full pathname (if any) of the egrep
         program.  After Configure runs, the value is reset to a
         plain `egrep' and is not useful.

     `emacs'
         From Loc.U:

         This variable is defined but not used by Configure.  The
         value is a plain '' and is not useful.


     `eunicefix'
         From Init.U:

         When running under Eunice this variable contains a
         command which will convert a shell script to the proper
         form of text file for it to be executable by the shell.
         On other systems it is a no-op.

     `exe_ext'
         From Unix.U:

         This is an old synonym for _exe.

     `expr'
         From Loc.U:

         This variable is used internally by Configure to
         determine the full pathname (if any) of the expr
         program.  After Configure runs, the value is reset to a
         plain `expr' and is not useful.

     `extensions'
         From Extensions.U:

         This variable holds a list of all extension files (both
         `XS' and non-xs linked into the package.  It is
         propagated to Config.pm and is typically used to test
         whether a particular extesion is available.

     f

     `fflushall'
         From fflushall.U:

         This symbol, if defined, tells that to flush all pending
         stdio output one must loop through all the stdio file
         handles stored in an array and fflush them.  Note that
         if fflushNULL is defined, fflushall will not even be
         probed for and will be left undefined.

     `fflushNULL'
         From fflushall.U:

         This symbol, if defined, tells that fflush(`NULL') does
         flush all pending stdio output.

     `find'
         From Loc.U:

         This variable is defined but not used by Configure.  The
         value is a plain '' and is not useful.

     `firstmakefile'
         From Unix.U:

         This variable defines the first file searched by make.
         On unix, it is makefile (then Makefile).  On case-
         insensitive systems, it might be something else.  This
         is only used to deal with convoluted make depend tricks.

     `flex'
         From Loc.U:

         This variable is defined but not used by Configure.  The
         value is a plain '' and is not useful.

     `fpossize'
         From fpossize.U:

         This variable contains the size of a fpostype in bytes.

     `fpostype'
         From fpostype.U:

         This variable defines Fpos_t to be something like
         fpos_t, long, uint, or whatever type is used to declare
         file positions in libc.

     `freetype'
         From mallocsrc.U:

         This variable contains the return type of free().  It is
         usually void, but occasionally int.

     `full_ar'
         From Loc_ar.U:

         This variable contains the full pathname to `ar',
         whether or not the user has specified `portability'.
         This is only used in the Makefile.SH.

     `full_csh'
         From d_csh.U:

         This variable contains the full pathname to `csh',
         whether or not the user has specified `portability'.
         This is only used in the compiled C program, and we
         assume that all systems which can share this executable
         will have the same full pathname to csh.

     `full_sed'
         From Loc_sed.U:

         This variable contains the full pathname to `sed',
         whether or not the user has specified `portability'.
         This is only used in the compiled C program, and we
         assume that all systems which can share this executable
         will have the same full pathname to sed.

     g

     `gccversion'
         From cc.U:

         If `GNU' cc (gcc) is used, this variable holds `1' or
         `2' to indicate whether the compiler is version 1 or 2.
         This is used in setting some of the default cflags.  It
         is set to '' if not gcc.

     `gidformat'
         From gidf.U:

         This variable contains the format string used for
         printing a Gid_t.

     `gidsign'
         From gidsign.U:

         This variable contains the signedness of a gidtype.  1
         for unsigned, -1 for signed.

     `gidsize'
         From gidsize.U:

         This variable contains the size of a gidtype in bytes.

     `gidtype'
         From gidtype.U:

         This variable defines Gid_t to be something like gid_t,
         int, ushort, or whatever type is used to declare the
         return type of getgid().  Typically, it is the type of
         group ids in the kernel.

     `glibpth'
         From libpth.U:

         This variable holds the general path (space-separated)
         used to find libraries.  It may contain directories that
         do not exist on this platform, libpth is the cleaned-up
         version.

     `grep'
         From Loc.U:

         This variable is used internally by Configure to
         determine the full pathname (if any) of the grep
         program.  After Configure runs, the value is reset to a
         plain `grep' and is not useful.

     `groupcat'
         From nis.U:

         This variable contains a command that produces the text
         of the /etc/group file.  This is normally "cat
         /etc/group", but can be "ypcat group" when `NIS' is
         used.  On some systems, such as os390, there may be no
         equivalent command, in which case this variable is
         unset.

     `groupstype'
         From groupstype.U:

         This variable defines Groups_t to be something like
         gid_t, int, ushort, or whatever type is used for the
         second argument to getgroups() and setgroups().
         Usually, this is the same as gidtype (gid_t), but
         sometimes it isn't.

     `gzip'
         From Loc.U:

         This variable is used internally by Configure to
         determine the full pathname (if any) of the gzip
         program.  After Configure runs, the value is reset to a
         plain `gzip' and is not useful.

     h

     `h_fcntl'
         From h_fcntl.U:

         This is variable gets set in various places to tell
         i_fcntl that <fcntl.h> should be included.

     `h_sysfile'
         From h_sysfile.U:

         This is variable gets set in various places to tell
         i_sys_file that <sys/file.h> should be included.

     `hint'
         From Oldconfig.U:

         Gives the type of hints used for previous answers. May
         be one of `default', `recommended' or `previous'.


     `hostcat'
         From nis.U:

         This variable contains a command that produces the text
         of the /etc/hosts file.  This is normally "cat
         /etc/hosts", but can be "ypcat hosts" when `NIS' is
         used.  On some systems, such as os390, there may be no
         equivalent command, in which case this variable is
         unset.

     `huge'
         From models.U:

         This variable contains a flag which will tell the C
         compiler and loader to produce a program running with a
         huge memory model.  If the huge model is not supported,
         contains the flag to produce large model programs.  It
         is up to the Makefile to use this.

     i

     `i16size'
         From perlxv.U:

         This variable is the size of an I16 in bytes.

     `i16type'
         From perlxv.U:

         This variable contains the C type used for Perl's I16.

     `i32size'
         From perlxv.U:

         This variable is the size of an I32 in bytes.

     `i32type'
         From perlxv.U:

         This variable contains the C type used for Perl's I32.

     `i64size'
         From perlxv.U:

         This variable is the size of an I64 in bytes.

     `i64type'
         From perlxv.U:

         This variable contains the C type used for Perl's I64.


     `i8size'
         From perlxv.U:

         This variable is the size of an I8 in bytes.

     `i8type'
         From perlxv.U:

         This variable contains the C type used for Perl's I8.

     `i_arpainet'
         From i_arpainet.U:

         This variable conditionally defines the `I_ARPA_INET'
         symbol, and indicates whether a C program should include
         <arpa/inet.h>.

     `i_bsdioctl'
         From i_sysioctl.U:

         This variable conditionally defines the `I_SYS_BSDIOCTL'
         symbol, which indicates to the C program that
         <sys/bsdioctl.h> exists and should be included.

     `i_db'
         From i_db.U:

         This variable conditionally defines the `I_DB' symbol,
         and indicates whether a C program may include Berkeley's
         `DB' include file <db.h>.

     `i_dbm'
         From i_dbm.U:

         This variable conditionally defines the `I_DBM' symbol,
         which indicates to the C program that <dbm.h> exists and
         should be included.

     `i_dirent'
         From i_dirent.U:

         This variable conditionally defines `I_DIRENT', which
         indicates to the C program that it should include
         <dirent.h>.

     `i_dld'
         From i_dld.U:

         This variable conditionally defines the `I_DLD' symbol,
         which indicates to the C program that <dld.h> (`GNU'
         dynamic loading) exists and should be included.

     `i_dlfcn'
         From i_dlfcn.U:

         This variable conditionally defines the `I_DLFCN'
         symbol, which indicates to the C program that <dlfcn.h>
         exists and should be included.

     `i_fcntl'
         From i_fcntl.U:

         This variable controls the value of `I_FCNTL' (which
         tells the C program to include <fcntl.h>).

     `i_float'
         From i_float.U:

         This variable conditionally defines the `I_FLOAT'
         symbol, and indicates whether a C program may include
         <float.h> to get symbols like `DBL_MAX' or `DBL_MIN',
         i.e. machine dependent floating point values.

     `i_gdbm'
         From i_gdbm.U:

         This variable conditionally defines the `I_GDBM' symbol,
         which indicates to the C program that <gdbm.h> exists
         and should be included.

     `i_grp'
         From i_grp.U:

         This variable conditionally defines the `I_GRP' symbol,
         and indicates whether a C program should include
         <grp.h>.

     `i_iconv'
         From i_iconv.U:

         This variable conditionally defines the `I_ICONV'
         symbol, and indicates whether a C program should include
         <iconv.h>.

     `i_ieeefp'
         From i_ieeefp.U:

         This variable conditionally defines the `I_IEEEFP'
         symbol, and indicates whether a C program should include
         <ieeefp.h>.

     `i_inttypes'
         From i_inttypes.U:

         This variable conditionally defines the `I_INTTYPES'
         symbol, and indicates whether a C program should include
         <inttypes.h>.

     `i_limits'
         From i_limits.U:

         This variable conditionally defines the `I_LIMITS'
         symbol, and indicates whether a C program may include
         <limits.h> to get symbols like `WORD_BIT' and friends.

     `i_locale'
         From i_locale.U:

         This variable conditionally defines the `I_LOCALE'
         symbol, and indicates whether a C program should include
         <locale.h>.

     `i_machcthr'
         From i_machcthr.U:

         This variable conditionally defines the
         `I_MACH_CTHREADS' symbol, and indicates whether a C
         program should include <mach/cthreads.h>.

     `i_malloc'
         From i_malloc.U:

         This variable conditionally defines the `I_MALLOC'
         symbol, and indicates whether a C program should include
         <malloc.h>.

     `i_math'
         From i_math.U:

         This variable conditionally defines the `I_MATH' symbol,
         and indicates whether a C program may include <math.h>.

     `i_memory'
         From i_memory.U:

         This variable conditionally defines the `I_MEMORY'
         symbol, and indicates whether a C program should include
         <memory.h>.

     `i_mntent'
         From i_mntent.U:

         This variable conditionally defines the `I_MNTENT'
         symbol, and indicates whether a C program should include
         <mntent.h>.

     `i_ndbm'
         From i_ndbm.U:

         This variable conditionally defines the `I_NDBM' symbol,
         which indicates to the C program that <ndbm.h> exists
         and should be included.

     `i_netdb'
         From i_netdb.U:

         This variable conditionally defines the `I_NETDB'
         symbol, and indicates whether a C program should include
         <netdb.h>.

     `i_neterrno'
         From i_neterrno.U:

         This variable conditionally defines the `I_NET_ERRNO'
         symbol, which indicates to the C program that
         <net/errno.h> exists and should be included.

     `i_netinettcp'
         From i_netinettcp.U:

         This variable conditionally defines the `I_NETINET_TCP'
         symbol, and indicates whether a C program should include
         <netinet/tcp.h>.

     `i_niin'
         From i_niin.U:

         This variable conditionally defines `I_NETINET_IN',
         which indicates to the C program that it should include
         <netinet/in.h>. Otherwise, you may try <sys/in.h>.

     `i_poll'
         From i_poll.U:

         This variable conditionally defines the `I_POLL' symbol,
         and indicates whether a C program should include
         <poll.h>.

     `i_pthread'
         From i_pthread.U:

         This variable conditionally defines the `I_PTHREAD'
         symbol, and indicates whether a C program should include
         <pthread.h>.

     `i_pwd'
         From i_pwd.U:

         This variable conditionally defines `I_PWD', which
         indicates to the C program that it should include
         <pwd.h>.

     `i_rpcsvcdbm'
         From i_dbm.U:

         This variable conditionally defines the `I_RPCSVC_DBM'
         symbol, which indicates to the C program that
         <rpcsvc/dbm.h> exists and should be included.  Some
         System V systems might need this instead of <dbm.h>.

     `i_sfio'
         From i_sfio.U:

         This variable conditionally defines the `I_SFIO' symbol,
         and indicates whether a C program should include
         <sfio.h>.

     `i_sgtty'
         From i_termio.U:

         This variable conditionally defines the `I_SGTTY'
         symbol, which indicates to the C program that it should
         include <sgtty.h> rather than <termio.h>.

     `i_shadow'
         From i_shadow.U:

         This variable conditionally defines the `I_SHADOW'
         symbol, and indicates whether a C program should include
         <shadow.h>.

     `i_socks'
         From i_socks.U:

         This variable conditionally defines the `I_SOCKS'
         symbol, and indicates whether a C program should include
         <socks.h>.

     `i_stdarg'
         From i_varhdr.U:

         This variable conditionally defines the `I_STDARG'
         symbol, which indicates to the C program that <stdarg.h>
         exists and should be included.

     `i_stddef'
         From i_stddef.U:

         This variable conditionally defines the `I_STDDEF'
         symbol, which indicates to the C program that <stddef.h>
         exists and should be included.

     `i_stdlib'
         From i_stdlib.U:

         This variable conditionally defines the `I_STDLIB'
         symbol, which indicates to the C program that <stdlib.h>
         exists and should be included.

     `i_string'
         From i_string.U:

         This variable conditionally defines the `I_STRING'
         symbol, which indicates that <string.h> should be
         included rather than <strings.h>.

     `i_sunmath'
         From i_sunmath.U:

         This variable conditionally defines the `I_SUNMATH'
         symbol, and indicates whether a C program should include
         <sunmath.h>.

     `i_sysaccess'
         From i_sysaccess.U:

         This variable conditionally defines the `I_SYS_ACCESS'
         symbol, and indicates whether a C program should include
         <sys/access.h>.

     `i_sysdir'
         From i_sysdir.U:

         This variable conditionally defines the `I_SYS_DIR'
         symbol, and indicates whether a C program should include
         <sys/dir.h>.

     `i_sysfile'
         From i_sysfile.U:

         This variable conditionally defines the `I_SYS_FILE'
         symbol, and indicates whether a C program should include
         <sys/file.h> to get `R_OK' and friends.

     `i_sysfilio'
         From i_sysioctl.U:

         This variable conditionally defines the `I_SYS_FILIO'
         symbol, which indicates to the C program that
         <sys/filio.h> exists and should be included in
         preference to <sys/ioctl.h>.

     `i_sysin'
         From i_niin.U:

         This variable conditionally defines `I_SYS_IN', which
         indicates to the C program that it should include
         <sys/in.h> instead of <netinet/in.h>.

     `i_sysioctl'
         From i_sysioctl.U:

         This variable conditionally defines the `I_SYS_IOCTL'
         symbol, which indicates to the C program that
         <sys/ioctl.h> exists and should be included.

     `i_syslog'
         From i_syslog.U:

         This variable conditionally defines the `I_SYSLOG'
         symbol, and indicates whether a C program should include
         <syslog.h>.

     `i_sysmman'
         From i_sysmman.U:

         This variable conditionally defines the `I_SYS_MMAN'
         symbol, and indicates whether a C program should include
         <sys/mman.h>.

     `i_sysmode'
         From i_sysmode.U:

         This variable conditionally defines the `I_SYSMODE'
         symbol, and indicates whether a C program should include
         <sys/mode.h>.

     `i_sysmount'
         From i_sysmount.U:

         This variable conditionally defines the `I_SYSMOUNT'
         symbol, and indicates whether a C program should include
         <sys/mount.h>.

     `i_sysndir'
         From i_sysndir.U:

         This variable conditionally defines the `I_SYS_NDIR'
         symbol, and indicates whether a C program should include
         <sys/ndir.h>.

     `i_sysparam'
         From i_sysparam.U:

         This variable conditionally defines the `I_SYS_PARAM'
         symbol, and indicates whether a C program should include
         <sys/param.h>.

     `i_sysresrc'
         From i_sysresrc.U:

         This variable conditionally defines the `I_SYS_RESOURCE'
         symbol, and indicates whether a C program should include
         <sys/resource.h>.

     `i_syssecrt'
         From i_syssecrt.U:

         This variable conditionally defines the `I_SYS_SECURITY'
         symbol, and indicates whether a C program should include
         <sys/security.h>.

     `i_sysselct'
         From i_sysselct.U:

         This variable conditionally defines `I_SYS_SELECT',
         which indicates to the C program that it should include
         <sys/select.h> in order to get the definition of struct
         timeval.

     `i_syssockio'
         From i_sysioctl.U:

         This variable conditionally defines `I_SYS_SOCKIO' to
         indicate to the C program that socket ioctl codes may be
         found in <sys/sockio.h> instead of <sys/ioctl.h>.

     `i_sysstat'
         From i_sysstat.U:

         This variable conditionally defines the `I_SYS_STAT'
         symbol, and indicates whether a C program should include
         <sys/stat.h>.

     `i_sysstatfs'
         From i_sysstatfs.U:

         This variable conditionally defines the `I_SYSSTATFS'
         symbol, and indicates whether a C program should include
         <sys/statfs.h>.

     `i_sysstatvfs'
         From i_sysstatvfs.U:

         This variable conditionally defines the `I_SYSSTATVFS'
         symbol, and indicates whether a C program should include
         <sys/statvfs.h>.

     `i_systime'
         From i_time.U:

         This variable conditionally defines `I_SYS_TIME', which
         indicates to the C program that it should include
         <sys/time.h>.

     `i_systimek'
         From i_time.U:

         This variable conditionally defines `I_SYS_TIME_KERNEL',
         which indicates to the C program that it should include
         <sys/time.h> with `KERNEL' defined.

     `i_systimes'
         From i_systimes.U:

         This variable conditionally defines the `I_SYS_TIMES'
         symbol, and indicates whether a C program should include
         <sys/times.h>.

     `i_systypes'
         From i_systypes.U:

         This variable conditionally defines the `I_SYS_TYPES'
         symbol, and indicates whether a C program should include
         <sys/types.h>.

     `i_sysuio'
         From i_sysuio.U:

         This variable conditionally defines the `I_SYSUIO'
         symbol, and indicates whether a C program should include
         <sys/uio.h>.

     `i_sysun'
         From i_sysun.U:

         This variable conditionally defines `I_SYS_UN', which
         indicates to the C program that it should include
         <sys/un.h> to get `UNIX' domain socket definitions.

     `i_sysutsname'
         From i_sysutsname.U:

         This variable conditionally defines the `I_SYSUTSNAME'
         symbol, and indicates whether a C program should include
         <sys/utsname.h>.


     `i_sysvfs'
         From i_sysvfs.U:

         This variable conditionally defines the `I_SYSVFS'
         symbol, and indicates whether a C program should include
         <sys/vfs.h>.

     `i_syswait'
         From i_syswait.U:

         This variable conditionally defines `I_SYS_WAIT', which
         indicates to the C program that it should include
         <sys/wait.h>.

     `i_termio'
         From i_termio.U:

         This variable conditionally defines the `I_TERMIO'
         symbol, which indicates to the C program that it should
         include <termio.h> rather than <sgtty.h>.

     `i_termios'
         From i_termio.U:

         This variable conditionally defines the `I_TERMIOS'
         symbol, which indicates to the C program that the
         `POSIX' <termios.h> file is to be included.

     `i_time'
         From i_time.U:

         This variable conditionally defines `I_TIME', which
         indicates to the C program that it should include
         <time.h>.

     `i_unistd'
         From i_unistd.U:

         This variable conditionally defines the `I_UNISTD'
         symbol, and indicates whether a C program should include
         <unistd.h>.

     `i_ustat'
         From i_ustat.U:

         This variable conditionally defines the `I_USTAT'
         symbol, and indicates whether a C program should include
         <ustat.h>.

     `i_utime'
         From i_utime.U:

         This variable conditionally defines the `I_UTIME'
         symbol, and indicates whether a C program should include
         <utime.h>.

     `i_values'
         From i_values.U:

         This variable conditionally defines the `I_VALUES'
         symbol, and indicates whether a C program may include
         <values.h> to get symbols like `MAXLONG' and friends.

     `i_varargs'
         From i_varhdr.U:

         This variable conditionally defines `I_VARARGS', which
         indicates to the C program that it should include
         <varargs.h>.

     `i_varhdr'
         From i_varhdr.U:

         Contains the name of the header to be included to get
         va_dcl definition.  Typically one of varargs.h or
         stdarg.h.

     `i_vfork'
         From i_vfork.U:

         This variable conditionally defines the `I_VFORK'
         symbol, and indicates whether a C program should include
         vfork.h.

     `ignore_versioned_solibs'
         From libs.U:

         This variable should be non-empty if non-versioned
         shared libraries (libfoo.so.x.y) are to be ignored
         (because they cannot be linked against).

     `inc_version_list'
         From inc_version_list.U:

         This variable specifies the list of subdirectories in
         over which perl.c:incpush() and lib/lib.pm will
         automatically search when adding directories to @`INC'.
         The elements in the list are separated by spaces.  This
         is only useful if you have a perl library directory tree
         structured like the default one.  See `INSTALL' for how
         this works.  The versioned site_perl directory was
         introduced in 5.005, so that is the lowest possible
         value.

     `inc_version_list_init'
         From inc_version_list.U:

         This variable holds the same list as inc_version_list,
         but each item is enclosed in double quotes and separated
         by commas, suitable for use in the
         `PERL_INC_VERSION_LIST' initialization.

     `incpath'
         From usrinc.U:

         This variable must preceed the normal include path to
         get hte right one, as in $incpath/usr/include or
         $incpath/usr/lib.  Value can be "" or /bsd43 on mips.

     `inews'
         From Loc.U:

         This variable is defined but not used by Configure.  The
         value is a plain '' and is not useful.

     `installarchlib'
         From archlib.U:

         This variable is really the same as archlibexp but may
         differ on those systems using `AFS'. For extra
         portability, only this variable should be used in
         makefiles.

     `installbin'
         From bin.U:

         This variable is the same as binexp unless `AFS' is
         running in which case the user is explicitely prompted
         for it. This variable should always be used in your
         makefiles for maximum portability.

     `installman1dir'
         From man1dir.U:

         This variable is really the same as man1direxp, unless
         you are using `AFS' in which case it points to the
         read/write location whereas man1direxp only points to
         the read-only access location. For extra portability,
         you should only use this variable within your makefiles.

     `installman3dir'
         From man3dir.U:

         This variable is really the same as man3direxp, unless
         you are using `AFS' in which case it points to the
         read/write location whereas man3direxp only points to
         the read-only access location. For extra portability,
         you should only use this variable within your makefiles.

     `installprefix'
         From installprefix.U:

         This variable holds the name of the directory below
         which "make install" will install the package.  For most
         users, this is the same as prefix.  However, it is
         useful for installing the software into a different
         (usually temporary) location after which it can be
         bundled up and moved somehow to the final location
         specified by prefix.

     `installprefixexp'
         From installprefix.U:

         This variable holds the full absolute path of
         installprefix with all ~-expansion done.

     `installprivlib'
         From privlib.U:

         This variable is really the same as privlibexp but may
         differ on those systems using `AFS'. For extra
         portability, only this variable should be used in
         makefiles.

     `installscript'
         From scriptdir.U:

         This variable is usually the same as scriptdirexp,
         unless you are on a system running `AFS', in which case
         they may differ slightly. You should always use this
         variable within your makefiles for portability.

     `installsitearch'
         From sitearch.U:

         This variable is really the same as sitearchexp but may
         differ on those systems using `AFS'. For extra
         portability, only this variable should be used in
         makefiles.

     `installsitebin'
         From sitebin.U:

         This variable is usually the same as sitebinexp, unless
         you are on a system running `AFS', in which case they
         may differ slightly. You should always use this variable
         within your makefiles for portability.

     `installsitelib'
         From sitelib.U:

         This variable is really the same as sitelibexp but may
         differ on those systems using `AFS'. For extra
         portability, only this variable should be used in
         makefiles.

     `installstyle'
         From installstyle.U:

         This variable describes the `style' of the perl
         installation.  This is intended to be useful for tools
         that need to manipulate entire perl distributions.  Perl
         itself doesn't use this to find its libraries -- the
         library directories are stored directly in Config.pm.
         Currently, there are only two styles:  `lib' and
         lib/perl5.  The default library locations (e.g. privlib,
         sitelib) are either $prefix/lib or $prefix/lib/perl5.
         The former is useful if $prefix is a directory dedicated
         to perl (e.g. /opt/perl), while the latter is useful if
         $prefix is shared by many packages, e.g. if
         $prefix=/usr/local.

                 This may later be extended to include other information, so

                 be careful with pattern-matching on the results.

                 For compatibility with F<perl5.005> and earlier, the default

                 setting is based on whether or not $prefix contains the string
         C<perl>.


     `installusrbinperl'
         From instubperl.U:

         This variable tells whether Perl should be installed
         also as /usr/bin/perl in addition to $installbin/perl

     `installvendorarch'
         From vendorarch.U:

         This variable is really the same as vendorarchexp but
         may differ on those systems using `AFS'. For extra
         portability, only this variable should be used in
         makefiles.

     `installvendorbin'
         From vendorbin.U:

         This variable is really the same as vendorbinexp but may
         differ on those systems using `AFS'. For extra
         portability, only this variable should be used in
         makefiles.

     `installvendorlib'
         From vendorlib.U:

         This variable is really the same as vendorlibexp but may
         differ on those systems using `AFS'. For extra
         portability, only this variable should be used in
         makefiles.

     `intsize'
         From intsize.U:

         This variable contains the value of the `INTSIZE'
         symbol, which indicates to the C program how many bytes
         there are in an int.

     `ivdformat'
         From perlxvf.U:

         This variable contains the format string used for
         printing a Perl `IV' as a signed decimal integer.

     `ivsize'
         From perlxv.U:

         This variable is the size of an `IV' in bytes.

     `ivtype'
         From perlxv.U:

         This variable contains the C type used for Perl's `IV'.

     k

     `known_extensions'
         From Extensions.U:

         This variable holds a list of all `XS' extensions
         included in the package.

     `ksh'
         From Loc.U:

         This variable is defined but not used by Configure.  The
         value is a plain '' and is not useful.



     l

     `large'
         From models.U:

         This variable contains a flag which will tell the C
         compiler and loader to produce a program running with a
         large memory model.  It is up to the Makefile to use
         this.

     `ld'
         From dlsrc.U:

         This variable indicates the program to be used to link
         libraries for dynamic loading.  On some systems, it is
         `ld'.  On `ELF' systems, it should be $cc.  Mostly,
         we'll try to respect the hint file setting.

     `lddlflags'
         From dlsrc.U:

         This variable contains any special flags that might need
         to be passed to $ld to create a shared library suitable
         for dynamic loading.  It is up to the makefile to use
         it.  For hpux, it should be `-b'.  For sunos 4.1, it is
         empty.

     `ldflags'
         From ccflags.U:

         This variable contains any additional C loader flags
         desired by the user.  It is up to the Makefile to use
         this.

     `ldlibpthname'
         From libperl.U:

         This variable holds the name of the shared library
         search path, often `LD_LIBRARY_PATH'.  To get an empty
         string, the hints file must set this to `none'.

     `less'
         From Loc.U:

         This variable is used internally by Configure to
         determine the full pathname (if any) of the less
         program.  After Configure runs, the value is reset to a
         plain `less' and is not useful.

     `lib_ext'
         From Unix.U:

         This is an old synonym for _a.

     `libc'
         From libc.U:

         This variable contains the location of the C library.

     `libperl'
         From libperl.U:

         The perl executable is obtained by linking perlmain.c
         with libperl, any static extensions (usually just
         DynaLoader), and any other libraries needed on this
         system.  libperl is usually libperl.a, but can also be
         libperl.so.xxx if the user wishes to build a perl
         executable with a shared library.

     `libpth'
         From libpth.U:

         This variable holds the general path (space-separated)
         used to find libraries. It is intended to be used by
         other units.

     `libs'
         From libs.U:

         This variable holds the additional libraries we want to
         use.  It is up to the Makefile to deal with it.

     `libsdirs'
         From libs.U:

         This variable holds the directory names aka dirnames of
         the libraries we found and accepted, duplicates are
         removed.

     `libsfiles'
         From libs.U:

         This variable holds the filenames aka basenames of the
         libraries we found and accepted.

     `libsfound'
         From libs.U:

         This variable holds the full pathnames of the libraries
         we found and accepted.

     `libspath'
         From libs.U:

         This variable holds the directory names probed for
         libraries.

     `libswanted'
         From Myinit.U:

         This variable holds a list of all the libraries we want
         to search.  The order is chosen to pick up the c library
         ahead of ucb or bsd libraries for SVR4.

     `line'
         From Loc.U:

         This variable is defined but not used by Configure.  The
         value is a plain '' and is not useful.

     `lint'
         From Loc.U:

         This variable is defined but not used by Configure.  The
         value is a plain '' and is not useful.

     `lkflags'
         From ccflags.U:

         This variable contains any additional C partial linker
         flags desired by the user.  It is up to the Makefile to
         use this.

     `ln'
         From Loc.U:

         This variable is used internally by Configure to
         determine the full pathname (if any) of the ln program.
         After Configure runs, the value is reset to a plain `ln'
         and is not useful.

     `lns'
         From lns.U:

         This variable holds the name of the command to make
         symbolic links (if they are supported).  It can be used
         in the Makefile. It is either `ln -s' or `ln'

     `locincpth'
         From ccflags.U:

         This variable contains a list of additional directories
         to be searched by the compiler.  The appropriate `-I'
         directives will be added to ccflags.  This is intended
         to simplify setting local directories from the Configure
         command line.  It's not much, but it parallels the
         loclibpth stuff in libpth.U.

     `loclibpth'
         From libpth.U:

         This variable holds the paths (space-separated) used to
         find local libraries.  It is prepended to libpth, and is
         intended to be easily set from the command line.

     `longdblsize'
         From d_longdbl.U:

         This variable contains the value of the
         `LONG_DOUBLESIZE' symbol, which indicates to the C
         program how many bytes there are in a long double, if
         this system supports long doubles.

     `longlongsize'
         From d_longlong.U:

         This variable contains the value of the `LONGLONGSIZE'
         symbol, which indicates to the C program how many bytes
         there are in a long long, if this system supports long
         long.

     `longsize'
         From intsize.U:

         This variable contains the value of the `LONGSIZE'
         symbol, which indicates to the C program how many bytes
         there are in a long.

     `lp'
         From Loc.U:

         This variable is defined but not used by Configure.  The
         value is a plain '' and is not useful.

     `lpr'
         From Loc.U:

         This variable is defined but not used by Configure.  The
         value is a plain '' and is not useful.

     `ls'
         From Loc.U:

         This variable is used internally by Configure to
         determine the full pathname (if any) of the ls program.
         After Configure runs, the value is reset to a plain `ls'
         and is not useful.

     `lseeksize'
         From lseektype.U:

         This variable defines lseektype to be something like
         off_t, long, or whatever type is used to declare lseek
         offset's type in the kernel (which also appears to be
         lseek's return type).

     `lseektype'
         From lseektype.U:

         This variable defines lseektype to be something like
         off_t, long, or whatever type is used to declare lseek
         offset's type in the kernel (which also appears to be
         lseek's return type).

     m

     `mail'
         From Loc.U:

         This variable is defined but not used by Configure.  The
         value is a plain '' and is not useful.

     `mailx'
         From Loc.U:

         This variable is defined but not used by Configure.  The
         value is a plain '' and is not useful.

     `make'
         From Loc.U:

         This variable is used internally by Configure to
         determine the full pathname (if any) of the make
         program.  After Configure runs, the value is reset to a
         plain `make' and is not useful.

     `make_set_make'
         From make.U:

         Some versions of `make' set the variable `MAKE'.  Others
         do not.  This variable contains the string to be
         included in Makefile.SH so that `MAKE' is set if needed,
         and not if not needed.  Possible values are:
         make_set_make=`#'        # If your make program handles
         this for you, make_set_make=`MAKE=$make'    # if it
         doesn't.  I used a comment character so that we can
         distinguish a `set' value (from a previous config.sh or
         Configure `-D' option) from an uncomputed value.


     `mallocobj'
         From mallocsrc.U:

         This variable contains the name of the malloc.o that
         this package generates, if that malloc.o is preferred
         over the system malloc.  Otherwise the value is null.
         This variable is intended for generating Makefiles.  See
         mallocsrc.

     `mallocsrc'
         From mallocsrc.U:

         This variable contains the name of the malloc.c that
         comes with the package, if that malloc.c is preferred
         over the system malloc.  Otherwise the value is null.
         This variable is intended for generating Makefiles.

     `malloctype'
         From mallocsrc.U:

         This variable contains the kind of ptr returned by
         malloc and realloc.

     `man1dir'
         From man1dir.U:

         This variable contains the name of the directory in
         which manual source pages are to be put.  It is the
         responsibility of the Makefile.SH to get the value of
         this into the proper command.  You must be prepared to
         do the ~name expansion yourself.

     `man1direxp'
         From man1dir.U:

         This variable is the same as the man1dir variable, but
         is filename expanded at configuration time, for
         convenient use in makefiles.

     `man1ext'
         From man1dir.U:

         This variable contains the extension that the manual
         page should have: one of `n', `l', or `1'.  The Makefile
         must supply the ..  See man1dir.

     `man3dir'
         From man3dir.U:

         This variable contains the name of the directory in
         which manual source pages are to be put.  It is the
         responsibility of the Makefile.SH to get the value of
         this into the proper command.  You must be prepared to
         do the ~name expansion yourself.

     `man3direxp'
         From man3dir.U:

         This variable is the same as the man3dir variable, but
         is filename expanded at configuration time, for
         convenient use in makefiles.

     `man3ext'
         From man3dir.U:

         This variable contains the extension that the manual
         page should have: one of `n', `l', or `3'.  The Makefile
         must supply the ..  See man3dir.

     M

     `Mcc'
         From Loc.U:

         This variable is used internally by Configure to
         determine the full pathname (if any) of the Mcc program.
         After Configure runs, the value is reset to a plain
         `Mcc' and is not useful.

     `medium'
         From models.U:

         This variable contains a flag which will tell the C
         compiler and loader to produce a program running with a
         medium memory model.  If the medium model is not
         supported, contains the flag to produce large model
         programs.  It is up to the Makefile to use this.

     `mips_type'
         From usrinc.U:

         This variable holds the environment type for the mips
         system.  Possible values are "BSD 4.3" and "System V".

     `mkdir'
         From Loc.U:

         This variable is used internally by Configure to
         determine the full pathname (if any) of the mkdir
         program.  After Configure runs, the value is reset to a
         plain `mkdir' and is not useful.

     `mmaptype'
         From d_mmap.U:
         This symbol contains the type of pointer returned by
         mmap() (and simultaneously the type of the first
         argument).  It can be `void *' or `caddr_t'.

     `models'
         From models.U:

         This variable contains the list of memory models
         supported by this system.  Possible component values are
         none, split, unsplit, small, medium, large, and huge.
         The component values are space separated.

     `modetype'
         From modetype.U:

         This variable defines modetype to be something like
         mode_t, int, unsigned short, or whatever type is used to
         declare file modes for system calls.

     `more'
         From Loc.U:

         This variable is used internally by Configure to
         determine the full pathname (if any) of the more
         program.  After Configure runs, the value is reset to a
         plain `more' and is not useful.

     `multiarch'
         From multiarch.U:

         This variable conditionally defines the `MULTIARCH'
         symbol which signifies the presence of multiplatform
         files.  This is normally set by hints files.

     `mv'
         From Loc.U:

         This variable is defined but not used by Configure.  The
         value is a plain '' and is not useful.

     `myarchname'
         From archname.U:

         This variable holds the architecture name computed by
         Configure in a previous run. It is not intended to be
         perused by any user and should never be set in a hint
         file.

     `mydomain'
         From myhostname.U:

         This variable contains the eventual value of the
         `MYDOMAIN' symbol, which is the domain of the host the
         program is going to run on.  The domain must be appended
         to myhostname to form a complete host name.  The dot
         comes with mydomain, and need not be supplied by the
         program.

     `myhostname'
         From myhostname.U:

         This variable contains the eventual value of the
         `MYHOSTNAME' symbol, which is the name of the host the
         program is going to run on.  The domain is not kept with
         hostname, but must be gotten from mydomain.  The dot
         comes with mydomain, and need not be supplied by the
         program.

     `myuname'
         From Oldconfig.U:

         The output of `uname -a' if available, otherwise the
         hostname. On Xenix, pseudo variables assignments in the
         output are stripped, thank you. The whole thing is then
         lower-cased.

     n

     `n' From n.U:

         This variable contains the `-n' flag if that is what
         causes the echo command to suppress newline.  Otherwise
         it is null.  Correct usage is $echo $n "prompt for a
         question: $c".

     `netdb_hlen_type'
         From netdbtype.U:

         This variable holds the type used for the 2nd argument
         to gethostbyaddr().  Usually, this is int or size_t or
         unsigned.  This is only useful if you have
         gethostbyaddr(), naturally.

     `netdb_host_type'
         From netdbtype.U:

         This variable holds the type used for the 1st argument
         to gethostbyaddr().  Usually, this is char * or void *,
         possibly with or without a const prefix.  This is only
         useful if you have gethostbyaddr(), naturally.

     `netdb_name_type'
         From netdbtype.U:

         This variable holds the type used for the argument to
         gethostbyname().  Usually, this is char * or const char
         *.  This is only useful if you have gethostbyname(),
         naturally.

     `netdb_net_type'
         From netdbtype.U:

         This variable holds the type used for the 1st argument
         to getnetbyaddr().  Usually, this is int or long.  This
         is only useful if you have getnetbyaddr(), naturally.

     `nm'
         From Loc.U:

         This variable is used internally by Configure to
         determine the full pathname (if any) of the nm program.
         After Configure runs, the value is reset to a plain `nm'
         and is not useful.

     `nm_opt'
         From usenm.U:

         This variable holds the options that may be necessary
         for nm.

     `nm_so_opt'
         From usenm.U:

         This variable holds the options that may be necessary
         for nm to work on a shared library but that can not be
         used on an archive library.  Currently, this is only
         used by Linux, where nm --dynamic is *required* to get
         symbols from an `ELF' library which has been stripped,
         but nm --dynamic is *fatal* on an archive library.
         Maybe Linux should just always set usenm=false.

     `nonxs_ext'
         From Extensions.U:

         This variable holds a list of all non-xs extensions
         included in the package.  All of them will be built.

     `nroff'
         From Loc.U:

         This variable is used internally by Configure to
         determine the full pathname (if any) of the nroff
         program.  After Configure runs, the value is reset to a
         plain `nroff' and is not useful.


     `nvsize'
         From perlxv.U:

         This variable is the size of an `NV' in bytes.

     `nvtype'
         From perlxv.U:

         This variable contains the C type used for Perl's `NV'.

     o

     `o_nonblock'
         From nblock_io.U:

         This variable bears the symbol value to be used during
         open() or fcntl() to turn on non-blocking I/O for a file
         descriptor. If you wish to switch between blocking and
         non-blocking, you may try ioctl(`FIOSNBIO') instead, but
         that is only supported by some devices.

     `obj_ext'
         From Unix.U:

         This is an old synonym for _o.

     `old_pthread_create_joinable'
         From d_pthrattrj.U:

         This variable defines the constant to use for creating
         joinable (aka undetached) pthreads.  Unused if pthread.h
         defines `PTHREAD_CREATE_JOINABLE'.  If used, possible
         values are `PTHREAD_CREATE_UNDETACHED' and
         `__UNDETACHED'.

     `optimize'
         From ccflags.U:

         This variable contains any optimizer/debugger flag that
         should be used.  It is up to the Makefile to use it.

     `orderlib'
         From orderlib.U:

         This variable is `true' if the components of libraries
         must be ordered (with `lorder $* | tsort`) before
         placing them in an archive.  Set to `false' if ranlib or
         ar can generate random libraries.

     `osname'
         From Oldconfig.U:

         This variable contains the operating system name (e.g.
         sunos, solaris, hpux, etc.).  It can be useful later on
         for setting defaults.  Any spaces are replaced with
         underscores.  It is set to a null string if we can't
         figure it out.

     `osvers'
         From Oldconfig.U:

         This variable contains the operating system version
         (e.g.  4.1.3, 5.2, etc.).  It is primarily used for
         helping select an appropriate hints file, but might be
         useful elsewhere for setting defaults.  It is set to ''
         if we can't figure it out.  We try to be flexible about
         how much of the version number to keep, e.g. if 4.1.1,
         4.1.2, and 4.1.3 are essentially the same for this
         package, hints files might just be os_4.0 or os_4.1,
         etc., not keeping separate files for each little
         release.

     p

     `package'
         From package.U:

         This variable contains the name of the package being
         constructed.  It is primarily intended for the use of
         later Configure units.

     `pager'
         From pager.U:

         This variable contains the name of the preferred pager
         on the system.  Usual values are (the full pathnames of)
         more, less, pg, or cat.

     `passcat'
         From nis.U:

         This variable contains a command that produces the text
         of the /etc/passwd file.  This is normally "cat
         /etc/passwd", but can be "ypcat passwd" when `NIS' is
         used.  On some systems, such as os390, there may be no
         equivalent command, in which case this variable is
         unset.

     `patchlevel'
         From patchlevel.U:

         The patchlevel level of this package.  The value of
         patchlevel comes from the patchlevel.h file.  In a
         version number such as 5.6.1, this is the `6'.  In
         patchlevel.h, this is referred to as `PERL_VERSION'.

     `path_sep'
         From Unix.U:

         This is an old synonym for p_ in Head.U, the character
         used to separate elements in the command shell search
         `PATH'.

     `perl5'
         From perl5.U:

         This variable contains the full path (if any) to a
         previously installed perl5.005 or later suitable for
         running the script to determine inc_version_list.

     `perl'
         From Loc.U:

         This variable is defined but not used by Configure.  The
         value is a plain '' and is not useful.

     P

     `PERL_REVISION'
         From Oldsyms.U:

         In a Perl version number such as 5.6.2, this is the 5.
         This value is manually set in patchlevel.h

     `PERL_SUBVERSION'
         From Oldsyms.U:

         In a Perl version number such as 5.6.2, this is the 2.
         Values greater than 50 represent potentially unstable
         development subversions.  This value is manually set in
         patchlevel.h

     `PERL_VERSION'
         From Oldsyms.U:

         In a Perl version number such as 5.6.2, this is the 6.
         This value is manually set in patchlevel.h

     `perladmin'
         From perladmin.U:

         Electronic mail address of the perl5 administrator.

     `perlpath'
         From perlpath.U:

         This variable contains the eventual value of the
         `PERLPATH' symbol, which contains the name of the perl
         interpreter to be used in shell scripts and in the "eval
         `exec'" idiom.

     `pg'
         From Loc.U:

         This variable is used internally by Configure to
         determine the full pathname (if any) of the pg program.
         After Configure runs, the value is reset to a plain `pg'
         and is not useful.

     `phostname'
         From myhostname.U:

         This variable contains the eventual value of the
         `PHOSTNAME' symbol, which is a command that can be fed
         to popen() to get the host name.  The program should
         probably not presume that the domain is or isn't there
         already.

     `pidtype'
         From pidtype.U:

         This variable defines `PIDTYPE' to be something like
         pid_t, int, ushort, or whatever type is used to declare
         process ids in the kernel.

     `plibpth'
         From libpth.U:

         Holds the private path used by Configure to find out the
         libraries.  Its value is prepend to libpth. This
         variable takes care of special machines, like the mips.
         Usually, it should be empty.

     `pm_apiversion'
         From xs_apiversion.U:

         This variable contains the version of the oldest perl
         compatible with the present perl.  (That is, pure perl
         modules written for $pm_apiversion will still work for
         the current version).  perl.c:incpush() and lib/lib.pm
         will automatically search in $sitelib for older
         directories across major versions back to pm_apiversion.
         This is only useful if you have a perl library directory
         tree structured like the default one.  The versioned
         site_perl library was introduced in 5.005, so that's the
         default setting for this variable.  It's hard to imagine
         it changing before Perl6.  It is included here for
         symmetry with xs_apiveprsion -- the searching algorithms
         will (presumably) be similar.  See the `INSTALL' file
         for how this works.

     `pmake'
         From Loc.U:

         This variable is defined but not used by Configure.  The
         value is a plain '' and is not useful.

     `pr'
         From Loc.U:

         This variable is defined but not used by Configure.  The
         value is a plain '' and is not useful.

     `prefix'
         From prefix.U:

         This variable holds the name of the directory below
         which the user will install the package.  Usually, this
         is /usr/local, and executables go in /usr/local/bin,
         library stuff in /usr/local/lib, man pages in
         /usr/local/man, etc.  It is only used to set defaults
         for things in bin.U, mansrc.U, privlib.U, or
         scriptdir.U.

     `prefixexp'
         From prefix.U:

         This variable holds the full absolute path of the
         directory below which the user will install the package.
         Derived from prefix.

     `privlib'
         From privlib.U:

         This variable contains the eventual value of the
         `PRIVLIB' symbol, which is the name of the private
         library for this package.  It may have a ~ on the front.
         It is up to the makefile to eventually create this
         directory while performing installation (with ~
         substitution).

     `privlibexp'
         From privlib.U:

         This variable is the ~name expanded version of privlib,
         so that you may use it directly in Makefiles or shell
         scripts.

     `prototype'
         From prototype.U:
         This variable holds the eventual value of
         `CAN_PROTOTYPE', which indicates the C compiler can
         handle funciton prototypes.

     `ptrsize'
         From ptrsize.U:

         This variable contains the value of the `PTRSIZE'
         symbol, which indicates to the C program how many bytes
         there are in a pointer.

     q

     `quadkind'
         From quadtype.U:

         This variable, if defined, encodes the type of a quad:
         1 = int, 2 = long, 3 = long long, 4 = int64_t.

     `quadtype'
         From quadtype.U:

         This variable defines Quad_t to be something like long,
         int, long long, int64_t, or whatever type is used for
         64-bit integers.

     r

     `randbits'
         From randfunc.U:

         Indicates how many bits are produced by the function
         used to generate normalized random numbers.

     `randfunc'
         From randfunc.U:

         Indicates the name of the random number function to use.
         Values include drand48, random, and rand. In C programs,
         the `Drand01' macro is defined to generate uniformly
         distributed random numbers over the range [0., 1.[ (see
         drand01 and nrand).

     `randseedtype'
         From randfunc.U:

         Indicates the type of the argument of the seedfunc.

     `ranlib'
         From orderlib.U:

         This variable is set to the pathname of the ranlib
         program, if it is needed to generate random libraries.
         Set to `:' if ar can generate random libraries or if
         random libraries are not supported

     `rd_nodata'
         From nblock_io.U:

         This variable holds the return code from read() when no
         data is present. It should be -1, but some systems
         return 0 when `O_NDELAY' is used, which is a shame
         because you cannot make the difference between no data
         and an EOF.. Sigh!

     `revision'
         From patchlevel.U:

         The value of revision comes from the patchlevel.h file.
         In a version number such as 5.6.1, this is the `5'.  In
         patchlevel.h, this is referred to as `PERL_REVISION'.

     `rm'
         From Loc.U:

         This variable is used internally by Configure to
         determine the full pathname (if any) of the rm program.
         After Configure runs, the value is reset to a plain `rm'
         and is not useful.

     `rmail'
         From Loc.U:

         This variable is defined but not used by Configure.  The
         value is a plain '' and is not useful.

     `runnm'
         From usenm.U:

         This variable contains `true' or `false' depending
         whether the nm extraction should be performed or not,
         according to the value of usenm and the flags on the
         Configure command line.

     s

     `sched_yield'
         From d_pthread_y.U:

         This variable defines the way to yield the execution of
         the current thread.

     `scriptdir'
         From scriptdir.U:
         This variable holds the name of the directory in which
         the user wants to put publicly scripts for the package
         in question.  It is either the same directory as for
         binaries, or a special one that can be mounted across
         different architectures, like /usr/share. Programs must
         be prepared to deal with ~name expansion.

     `scriptdirexp'
         From scriptdir.U:

         This variable is the same as scriptdir, but is filename
         expanded at configuration time, for programs not wanting
         to bother with it.

     `sed'
         From Loc.U:

         This variable is used internally by Configure to
         determine the full pathname (if any) of the sed program.
         After Configure runs, the value is reset to a plain
         `sed' and is not useful.

     `seedfunc'
         From randfunc.U:

         Indicates the random number generating seed function.
         Values include srand48, srandom, and srand.

     `selectminbits'
         From selectminbits.U:

         This variable holds the minimum number of bits operated
         by select.  That is, if you do select(n, ...), how many
         bits at least will be cleared in the masks if some
         activity is detected.  Usually this is either n or
         32*ceil(n/32), especially many little-endians do the
         latter.  This is only useful if you have select(),
         naturally.

     `selecttype'
         From selecttype.U:

         This variable holds the type used for the 2nd, 3rd, and
         4th arguments to select.  Usually, this is `fd_set *',
         if `HAS_FD_SET' is defined, and `int *' otherwise.  This
         is only useful if you have select(), naturally.

     `sendmail'
         From Loc.U:

         This variable is defined but not used by Configure.  The
         value is a plain '' and is not useful.

     `sh'
         From sh.U:

         This variable contains the full pathname of the shell
         used on this system to execute Bourne shell scripts.
         Usually, this will be /bin/sh, though it's possible that
         some systems will have /bin/ksh, /bin/pdksh, /bin/ash,
         /bin/bash, or even something such as D:/bin/sh.exe.
         This unit comes before Options.U, so you can't set sh
         with a `-D' option, though you can override this (and
         startsh) with `-O -Dsh=/bin/whatever -Dstartsh=whatever'

     `shar'
         From Loc.U:

         This variable is defined but not used by Configure.  The
         value is a plain '' and is not useful.

     `sharpbang'
         From spitshell.U:

         This variable contains the string #! if this system
         supports that construct.

     `shmattype'
         From d_shmat.U:

         This symbol contains the type of pointer returned by
         shmat().  It can be `void *' or `char *'.

     `shortsize'
         From intsize.U:

         This variable contains the value of the `SHORTSIZE'
         symbol which indicates to the C program how many bytes
         there are in a short.

     `shrpenv'
         From libperl.U:

         If the user builds a shared libperl.so, then we need to
         tell the `perl' executable where it will be able to find
         the installed libperl.so. One way to do this on some
         systems is to set the environment variable `LD_RUN_PATH'
         to the directory that will be the final location of the
         shared libperl.so.  The makefile can use this with
         something like $shrpenv $(`CC') -o perl perlmain.o
         $libperl $libs Typical values are shrpenv="env
         `LD_RUN_PATH'=$archlibexp/`CORE'" or shrpenv='' See the
         main perl Makefile.SH for actual working usage.
         Alternatively, we might be able to use a command line
         option such as -R $archlibexp/`CORE' (Solaris, NetBSD)
         or -Wl,-rpath $archlibexp/`CORE' (Linux).

     `shsharp'
         From spitshell.U:

         This variable tells further Configure units whether your
         sh can handle # comments.

     `sig_count'
         From sig_name.U:

         This variable holds a number larger than the largest
         valid signal number.  This is usually the same as the
         `NSIG' macro.

     `sig_name'
         From sig_name.U:

         This variable holds the signal names, space separated.
         The leading `SIG' in signal name is removed.  A `ZERO'
         is prepended to the list.  This is currently not used.

     `sig_name_init'
         From sig_name.U:

         This variable holds the signal names, enclosed in double
         quotes and separated by commas, suitable for use in the
         `SIG_NAME' definition below.  A `ZERO' is prepended to
         the list, and the list is terminated with a plain 0.
         The leading `SIG' in signal names is removed. See
         sig_num.

     `sig_num'
         From sig_name.U:

         This variable holds the signal numbers, space separated.
         A `ZERO' is prepended to the list (corresponding to the
         fake `SIGZERO'), and the list is terminated with a 0.
         Those numbers correspond to the value of the signal
         listed in the same place within the sig_name list.

     `sig_num_init'
         From sig_name.U:

         This variable holds the signal numbers, enclosed in
         double quotes and separated by commas, suitable for use
         in the `SIG_NUM' definition below.  A `ZERO' is
         prepended to the list, and the list is terminated with a
         plain 0.

     `signal_t'
         From d_voidsig.U:
         This variable holds the type of the signal handler (void
         or int).

     `sitearch'
         From sitearch.U:

         This variable contains the eventual value of the
         `SITEARCH' symbol, which is the name of the private
         library for this package.  It may have a ~ on the front.
         It is up to the makefile to eventually create this
         directory while performing installation (with ~
         substitution).  The standard distribution will put
         nothing in this directory.  After perl has been
         installed, users may install their own local
         architecture-dependent modules in this directory with
         MakeMaker Makefile.PL or equivalent.  See `INSTALL' for
         details.

     `sitearchexp'
         From sitearch.U:

         This variable is the ~name expanded version of sitearch,
         so that you may use it directly in Makefiles or shell
         scripts.

     `sitebin'
         From sitebin.U:

         This variable holds the name of the directory in which
         the user wants to put add-on publicly executable files
         for the package in question.  It is most often a local
         directory such as /usr/local/bin. Programs using this
         variable must be prepared to deal with ~name
         substitution.  The standard distribution will put
         nothing in this directory.  After perl has been
         installed, users may install their own local executables
         in this directory with MakeMaker Makefile.PL or
         equivalent.  See `INSTALL' for details.

     `sitebinexp'
         From sitebin.U:

         This is the same as the sitebin variable, but is
         filename expanded at configuration time, for use in your
         makefiles.

     `sitelib'
         From sitelib.U:

         This variable contains the eventual value of the
         `SITELIB' symbol, which is the name of the private
         library for this package.  It may have a ~ on the front.
         It is up to the makefile to eventually create this
         directory while performing installation (with ~
         substitution).  The standard distribution will put
         nothing in this directory.  After perl has been
         installed, users may install their own local
         architecture-independent modules in this directory with
         MakeMaker Makefile.PL or equivalent.  See `INSTALL' for
         details.

     `sitelib_stem'
         From sitelib.U:

         This variable is $sitelibexp with any trailing version-
         specific component removed.  The elements in
         inc_version_list (inc_version_list.U) can be tacked onto
         this variable to generate a list of directories to
         search.

     `sitelibexp'
         From sitelib.U:

         This variable is the ~name expanded version of sitelib,
         so that you may use it directly in Makefiles or shell
         scripts.

     `siteprefix'
         From siteprefix.U:

         This variable holds the full absolute path of the
         directory below which the user will install add-on
         packages.  See `INSTALL' for usage and examples.

     `siteprefixexp'
         From siteprefix.U:

         This variable holds the full absolute path of the
         directory below which the user will install add-on
         packages.  Derived from siteprefix.

     `sizesize'
         From sizesize.U:

         This variable contains the size of a sizetype in bytes.

     `sizetype'
         From sizetype.U:

         This variable defines sizetype to be something like
         size_t, unsigned long, or whatever type is used to
         declare length parameters for string functions.


     `sleep'
         From Loc.U:

         This variable is defined but not used by Configure.  The
         value is a plain '' and is not useful.

     `smail'
         From Loc.U:

         This variable is defined but not used by Configure.  The
         value is a plain '' and is not useful.

     `small'
         From models.U:

         This variable contains a flag which will tell the C
         compiler and loader to produce a program running with a
         small memory model.  It is up to the Makefile to use
         this.

     `so'
         From so.U:

         This variable holds the extension used to identify
         shared libraries (also known as shared objects) on the
         system. Usually set to `so'.

     `sockethdr'
         From d_socket.U:

         This variable has any cpp `-I' flags needed for socket
         support.

     `socketlib'
         From d_socket.U:

         This variable has the names of any libraries needed for
         socket support.

     `socksizetype'
         From socksizetype.U:

         This variable holds the type used for the size argument
         for various socket calls like accept.  Usual values
         include socklen_t, size_t, and int.

     `sort'
         From Loc.U:

         This variable is used internally by Configure to
         determine the full pathname (if any) of the sort
         program.  After Configure runs, the value is reset to a
         plain `sort' and is not useful.

     `spackage'
         From package.U:

         This variable contains the name of the package being
         constructed, with the first letter uppercased, i.e.
         suitable for starting sentences.

     `spitshell'
         From spitshell.U:

         This variable contains the command necessary to spit out
         a runnable shell on this system.  It is either cat or a
         grep `-v' for # comments.

     `split'
         From models.U:

         This variable contains a flag which will tell the C
         compiler and loader to produce a program that will run
         in separate I and D space, for those machines that
         support separation of instruction and data space.  It is
         up to the Makefile to use this.

     `sPRId64'
         From quadfio.U:

         This variable, if defined, contains the string used by
         stdio to format 64-bit decimal numbers (format `d') for
         output.

     `sPRIeldbl'
         From longdblfio.U:

         This variable, if defined, contains the string used by
         stdio to format long doubles (format `e') for output.

     `sPRIEldbl'
         From longdblfio.U:

         This variable, if defined, contains the string used by
         stdio to format long doubles (format `E') for output.

     `sPRIfldbl'
         From longdblfio.U:

         This variable, if defined, contains the string used by
         stdio to format long doubles (format `f') for output.

     `sPRIFldbl'
         From longdblfio.U:
         This variable, if defined, contains the string used by
         stdio to format long doubles (format `F') for output.

     `sPRIgldbl'
         From longdblfio.U:

         This variable, if defined, contains the string used by
         stdio to format long doubles (format `g') for output.

     `sPRIGldbl'
         From longdblfio.U:

         This variable, if defined, contains the string used by
         stdio to format long doubles (format `G') for output.

     `sPRIi64'
         From quadfio.U:

         This variable, if defined, contains the string used by
         stdio to format 64-bit decimal numbers (format `i') for
         output.

     `sPRIo64'
         From quadfio.U:

         This variable, if defined, contains the string used by
         stdio to format 64-bit octal numbers (format `o') for
         output.

     `sPRIu64'
         From quadfio.U:

         This variable, if defined, contains the string used by
         stdio to format 64-bit unsigned decimal numbers (format
         `u') for output.

     `sPRIx64'
         From quadfio.U:

         This variable, if defined, contains the string used by
         stdio to format 64-bit hexadecimal numbers (format `x')
         for output.

     `sPRIX64'
         From quadfio.U:

         This variable, if defined, contains the string used by
         stdio to format 64-bit hExADECimAl numbers (format `X')
         for output.

     `src'
         From src.U:
         This variable holds the path to the package source. It
         is up to the Makefile to use this variable and set
         `VPATH' accordingly to find the sources remotely.

     `ssizetype'
         From ssizetype.U:

         This variable defines ssizetype to be something like
         ssize_t, long or int.  It is used by functions that
         return a count of bytes or an error condition.  It must
         be a signed type.  We will pick a type such that
         sizeof(SSize_t) == sizeof(Size_t).

     `startperl'
         From startperl.U:

         This variable contains the string to put on the front of
         a perl script to make sure (hopefully) that it runs with
         perl and not some shell. Of course, that leading line
         must be followed by the classical perl idiom:  eval
         'exec perl -S $0 ${1+`$@'}' if
         $running_under_some_shell; to guarantee perl startup
         should the shell execute the script. Note that this
         magic incatation is not understood by csh.

     `startsh'
         From startsh.U:

         This variable contains the string to put on the front of
         a shell script to make sure (hopefully) that it runs
         with sh and not some other shell.

     `static_ext'
         From Extensions.U:

         This variable holds a list of `XS' extension files we
         want to link statically into the package.  It is used by
         Makefile.

     `stdchar'
         From stdchar.U:

         This variable conditionally defines `STDCHAR' to be the
         type of char used in stdio.h.  It has the values
         "unsigned char" or `char'.

     `stdio_base'
         From d_stdstdio.U:

         This variable defines how, given a `FILE' pointer, fp,
         to access the _base field (or equivalent) of stdio.h's
         `FILE' structure.  This will be used to define the macro
         FILE_base(fp).

     `stdio_bufsiz'
         From d_stdstdio.U:

         This variable defines how, given a `FILE' pointer, fp,
         to determine the number of bytes store in the I/O buffer
         pointer to by the _base field (or equivalent) of
         stdio.h's `FILE' structure.  This will be used to define
         the macro FILE_bufsiz(fp).

     `stdio_cnt'
         From d_stdstdio.U:

         This variable defines how, given a `FILE' pointer, fp,
         to access the _cnt field (or equivalent) of stdio.h's
         `FILE' structure.  This will be used to define the macro
         FILE_cnt(fp).

     `stdio_filbuf'
         From d_stdstdio.U:

         This variable defines how, given a `FILE' pointer, fp,
         to tell stdio to refill it's internal buffers (?).  This
         will be used to define the macro FILE_filbuf(fp).

     `stdio_ptr'
         From d_stdstdio.U:

         This variable defines how, given a `FILE' pointer, fp,
         to access the _ptr field (or equivalent) of stdio.h's
         `FILE' structure.  This will be used to define the macro
         FILE_ptr(fp).

     `stdio_stream_array'
         From stdio_streams.U:

         This variable tells the name of the array holding the
         stdio streams.  Usual values include _iob, __iob, and
         __sF.

     `strings'
         From i_string.U:

         This variable holds the full path of the string header
         that will be used. Typically /usr/include/string.h or
         /usr/include/strings.h.

     `submit'
         From Loc.U:

         This variable is defined but not used by Configure.  The
         value is a plain '' and is not useful.

     `subversion'
         From patchlevel.U:

         The subversion level of this package.  The value of
         subversion comes from the patchlevel.h file.  In a
         version number such as 5.6.1, this is the `1'.  In
         patchlevel.h, this is referred to as `PERL_SUBVERSION'.
         This is unique to perl.

     `sysman'
         From sysman.U:

         This variable holds the place where the manual is
         located on this system. It is not the place where the
         user wants to put his manual pages. Rather it is the
         place where Configure may look to find manual for unix
         commands (section 1 of the manual usually). See mansrc.

     t

     `tail'
         From Loc.U:

         This variable is defined but not used by Configure.  The
         value is a plain '' and is not useful.

     `tar'
         From Loc.U:

         This variable is defined but not used by Configure.  The
         value is a plain '' and is not useful.

     `tbl'
         From Loc.U:

         This variable is defined but not used by Configure.  The
         value is a plain '' and is not useful.

     `tee'
         From Loc.U:

         This variable is defined but not used by Configure.  The
         value is a plain '' and is not useful.

     `test'
         From Loc.U:

         This variable is used internally by Configure to
         determine the full pathname (if any) of the test
         program.  After Configure runs, the value is reset to a
         plain `test' and is not useful.

     `timeincl'
         From i_time.U:

         This variable holds the full path of the included time
         header(s).

     `timetype'
         From d_time.U:

         This variable holds the type returned by time(). It can
         be long, or time_t on `BSD' sites (in which case
         <sys/types.h> should be included). Anyway, the type
         Time_t should be used.

     `touch'
         From Loc.U:

         This variable is used internally by Configure to
         determine the full pathname (if any) of the touch
         program.  After Configure runs, the value is reset to a
         plain `touch' and is not useful.

     `tr'
         From Loc.U:

         This variable is used internally by Configure to
         determine the full pathname (if any) of the tr program.
         After Configure runs, the value is reset to a plain `tr'
         and is not useful.

     `trnl'
         From trnl.U:

         This variable contains the value to be passed to the
         tr(1) command to transliterate a newline.  Typical
         values are `\012' and `\n'.  This is needed for `EBCDIC'
         systems where newline is not necessarily `\012'.

     `troff'
         From Loc.U:

         This variable is defined but not used by Configure.  The
         value is a plain '' and is not useful.

     u

     `u16size'
         From perlxv.U:

         This variable is the size of an U16 in bytes.

     `u16type'
         From perlxv.U:

         This variable contains the C type used for Perl's U16.

     `u32size'
         From perlxv.U:

         This variable is the size of an U32 in bytes.

     `u32type'
         From perlxv.U:

         This variable contains the C type used for Perl's U32.

     `u64size'
         From perlxv.U:

         This variable is the size of an U64 in bytes.

     `u64type'
         From perlxv.U:

         This variable contains the C type used for Perl's U64.

     `u8size'
         From perlxv.U:

         This variable is the size of an U8 in bytes.

     `u8type'
         From perlxv.U:

         This variable contains the C type used for Perl's U8.

     `uidformat'
         From uidf.U:

         This variable contains the format string used for
         printing a Uid_t.

     `uidsign'
         From uidsign.U:

         This variable contains the signedness of a uidtype.  1
         for unsigned, -1 for signed.

     `uidsize'
         From uidsize.U:

         This variable contains the size of a uidtype in bytes.

     `uidtype'
         From uidtype.U:

         This variable defines Uid_t to be something like uid_t,
         int, ushort, or whatever type is used to declare user
         ids in the kernel.

     `uname'
         From Loc.U:

         This variable is used internally by Configure to
         determine the full pathname (if any) of the uname
         program.  After Configure runs, the value is reset to a
         plain `uname' and is not useful.

     `uniq'
         From Loc.U:

         This variable is used internally by Configure to
         determine the full pathname (if any) of the uniq
         program.  After Configure runs, the value is reset to a
         plain `uniq' and is not useful.

     `uquadtype'
         From quadtype.U:

         This variable defines Uquad_t to be something like
         unsigned long, unsigned int, unsigned long long,
         uint64_t, or whatever type is used for 64-bit integers.

     `use5005threads'
         From usethreads.U:

         This variable conditionally defines the USE_5005THREADS
         symbol, and indicates that Perl should be built to use
         the 5.005-based threading implementation.

     `use64bitall'
         From use64bits.U:

         This variable conditionally defines the USE_64_BIT_ALL
         symbol, and indicates that 64-bit integer types should
         be used when available.  The maximal possible 64-bitness
         is employed: LP64 or ILP64, meaning that you will be
         able to use more than 2 gigabytes of memory.  This mode
         is even more binary incompatible than USE_64_BIT_INT.
         You may not be able to run the resulting executable in a
         32-bit `CPU' at all or you may need at least to reboot
         your `OS' to 64-bit mode.

     `use64bitint'
         From use64bits.U:
         This variable conditionally defines the USE_64_BIT_INT
         symbol, and indicates that 64-bit integer types should
         be used when available.  The minimal possible 64-bitness
         is employed, just enough to get 64-bit integers into
         Perl.  This may mean using for example "long longs",
         while your memory may still be limited to 2 gigabytes.

     `usedl'
         From dlsrc.U:

         This variable indicates if the system supports dynamic
         loading of some sort.  See also dlsrc and dlobj.

     `useithreads'
         From usethreads.U:

         This variable conditionally defines the `USE_ITHREADS'
         symbol, and indicates that Perl should be built to use
         the interpreter-based threading implementation.

     `uselargefiles'
         From uselfs.U:

         This variable conditionally defines the
         `USE_LARGE_FILES' symbol, and indicates that large file
         interfaces should be used when available.

     `uselongdouble'
         From uselongdbl.U:

         This variable conditionally defines the
         `USE_LONG_DOUBLE' symbol, and indicates that long
         doubles should be used when available.

     `usemorebits'
         From usemorebits.U:

         This variable conditionally defines the `USE_MORE_BITS'
         symbol, and indicates that explicit 64-bit interfaces
         and long doubles should be used when available.

     `usemultiplicity'
         From usemultiplicity.U:

         This variable conditionally defines the `MULTIPLICITY'
         symbol, and indicates that Perl should be built to use
         multiplicity.

     `usemymalloc'
         From mallocsrc.U:

         This variable contains y if the malloc that comes with
         this package is desired over the system's version of
         malloc.  People often include special versions of malloc
         for effiency, but such versions are often less portable.
         See also mallocsrc and mallocobj.  If this is `y', then
         -lmalloc is removed from $libs.

     `usenm'
         From usenm.U:

         This variable contains `true' or `false' depending
         whether the nm extraction is wanted or not.

     `useopcode'
         From Extensions.U:

         This variable holds either `true' or `false' to indicate
         whether the Opcode extension should be used.  The sole
         use for this currently is to allow an easy mechanism for
         users to skip the Opcode extension from the Configure
         command line.

     `useperlio'
         From useperlio.U:

         This variable conditionally defines the `USE_PERLIO'
         symbol, and indicates that the PerlIO abstraction should
         be used throughout.

     `useposix'
         From Extensions.U:

         This variable holds either `true' or `false' to indicate
         whether the `POSIX' extension should be used.  The sole
         use for this currently is to allow an easy mechanism for
         hints files to indicate that `POSIX' will not compile on
         a particular system.

     `usesfio'
         From d_sfio.U:

         This variable is set to true when the user agrees to use
         sfio.  It is set to false when sfio is not available or
         when the user explicitely requests not to use sfio.  It
         is here primarily so that command-line settings can
         override the auto-detection of d_sfio without running
         into a "WHOA THERE".

     `useshrplib'
         From libperl.U:

         This variable is set to `yes' if the user wishes to
         build a shared libperl, and `no' otherwise.

     `usesocks'
         From usesocks.U:

         This variable conditionally defines the `USE_SOCKS'
         symbol, and indicates that Perl should be built to use
         `SOCKS'.

     `usethreads'
         From usethreads.U:

         This variable conditionally defines the `USE_THREADS'
         symbol, and indicates that Perl should be built to use
         threads.

     `usevendorprefix'
         From vendorprefix.U:

         This variable tells whether the vendorprefix and
         consequently other vendor* paths are in use.

     `usevfork'
         From d_vfork.U:

         This variable is set to true when the user accepts to
         use vfork.  It is set to false when no vfork is
         available or when the user explicitely requests not to
         use vfork.

     `usrinc'
         From usrinc.U:

         This variable holds the path of the include files, which
         is usually /usr/include. It is mainly used by other
         Configure units.

     `uuname'
         From Loc.U:

         This variable is defined but not used by Configure.  The
         value is a plain '' and is not useful.

     `uvoformat'
         From perlxvf.U:

         This variable contains the format string used for
         printing a Perl `UV' as an unsigned octal integer.

     `uvsize'
         From perlxv.U:

         This variable is the size of a `UV' in bytes.

     `uvtype'
         From perlxv.U:

         This variable contains the C type used for Perl's `UV'.

     `uvuformat'
         From perlxvf.U:

         This variable contains the format string used for
         printing a Perl `UV' as an unsigned decimal integer.

     `uvxformat'
         From perlxvf.U:

         This variable contains the format string used for
         printing a Perl `UV' as an unsigned hexadecimal integer.

     v

     `vendorarch'
         From vendorarch.U:

         This variable contains the value of the
         `PERL_VENDORARCH' symbol.  It may have a ~ on the front.
         The standard distribution will put nothing in this
         directory.  Vendors who distribute perl may wish to
         place their own architecture-dependent modules and
         extensions in this directory with MakeMaker Makefile.PL
         `INSTALLDIRS'=vendor or equivalent.  See `INSTALL' for
         details.

     `vendorarchexp'
         From vendorarch.U:

         This variable is the ~name expanded version of
         vendorarch, so that you may use it directly in Makefiles
         or shell scripts.

     `vendorbin'
         From vendorbin.U:

         This variable contains the eventual value of the
         `VENDORBIN' symbol.  It may have a ~ on the front.  The
         standard distribution will put nothing in this
         directory.  Vendors who distribute perl may wish to
         place additional binaries in this directory with
         MakeMaker Makefile.PL `INSTALLDIRS'=vendor or
         equivalent.  See `INSTALL' for details.

     `vendorbinexp'
         From vendorbin.U:

         This variable is the ~name expanded version of
         vendorbin, so that you may use it directly in Makefiles
         or shell scripts.

     `vendorlib'
         From vendorlib.U:

         This variable contains the eventual value of the
         `VENDORLIB' symbol, which is the name of the private
         library for this package.  The standard distribution
         will put nothing in this directory.  Vendors who
         distribute perl may wish to place their own modules in
         this directory with MakeMaker Makefile.PL
         `INSTALLDIRS'=vendor or equivalent.  See `INSTALL' for
         details.

     `vendorlib_stem'
         From vendorlib.U:

         This variable is $vendorlibexp with any trailing
         version-specific component removed.  The elements in
         inc_version_list (inc_version_list.U) can be tacked onto
         this variable to generate a list of directories to
         search.

     `vendorlibexp'
         From vendorlib.U:

         This variable is the ~name expanded version of
         vendorlib, so that you may use it directly in Makefiles
         or shell scripts.

     `vendorprefix'
         From vendorprefix.U:

         This variable holds the full absolute path of the
         directory below which the vendor will install add-on
         packages.  See `INSTALL' for usage and examples.

     `vendorprefixexp'
         From vendorprefix.U:

         This variable holds the full absolute path of the
         directory below which the vendor will install add-on
         packages.  Derived from vendorprefix.

     `version'
         From patchlevel.U:

         The full version number of this package, such as 5.6.1
         (or 5_6_1).  This combines revision, patchlevel, and
         subversion to get the full version number, including any
         possible subversions.  This is suitable for use as a
         directory name, and hence is filesystem dependent.

     `vi'
         From Loc.U:

         This variable is defined but not used by Configure.  The
         value is a plain '' and is not useful.

     `voidflags'
         From voidflags.U:

         This variable contains the eventual value of the
         `VOIDFLAGS' symbol, which indicates how much support of
         the void type is given by this compiler.  See
         `VOIDFLAGS' for more info.

     x

     `xlibpth'
         From libpth.U:

         This variable holds extra path (space-separated) used to
         find libraries on this platform, for example
         `CPU'-specific libraries (on multi-`CPU' platforms) may
         be listed here.

     `xs_apiversion'
         From xs_apiversion.U:

         This variable contains the version of the oldest perl
         binary compatible with the present perl.
         perl.c:incpush() and lib/lib.pm will automatically
         search in $sitearch for older directories across major
         versions back to xs_apiversion.  This is only useful if
         you have a perl library directory tree structured like
         the default one.  See `INSTALL' for how this works.  The
         versioned site_perl directory was introduced in 5.005,
         so that is the lowest possible value.  Since this can
         depend on compile time options (such as bincompat) it is
         set by Configure.  Other non-default sources of
         potential incompatibility, such as multiplicity,
         threads, debugging, 64bits, sfio, etc., are not checked
         for currently, though in principle we could go snooping
         around in old Config.pm files.

     z

     `zcat'
         From Loc.U:

         This variable is defined but not used by Configure.  The
         value is a plain '' and is not useful.

     `zip'
         From Loc.U:

         This variable is used internally by Configure to
         determine the full pathname (if any) of the zip program.
         After Configure runs, the value is reset to a plain
         `zip' and is not useful.



NOTE
     This module contains a good example of how to use tie to
     implement a cache and an example of how to make a tied
     variable readonly to those outside of it.









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