FreeBSD Porter's Handbook
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15.7 Writing something after `bsd.port.mk`

Do not write anything after the .include <bsd.port.mk> line. It usually can be avoided by including bsd.port.pre.mk somewhere in the middle of your Makefile and bsd.port.post.mk at the end.

Note: You need to include either the pre.mk/post.mk pair or bsd.port.mk only; do not mix these two.

bsd.port.pre.mk only defines a few variables, which can be used in tests in the Makefile, bsd.port.post.mk defines the rest.

Here are some important variables defined in bsd.port.pre.mk (this is not the complete list, please read bsd.port.mk for the complete list).

Variable	Description
`ARCH`	The architecture as returned by `uname -m` (e.g., `i386`)
`OPSYS`	The operating system type, as returned by `uname -s` (e.g., `FreeBSD`)
`OSREL`	The release version of the operating system (e.g., `2.1.5` or `2.2.7`)
`OSVERSION`	The numeric version of the operating system, same as `__FreeBSD_version`.
`PORTOBJFORMAT`	The object format of the system (`aout` or `elf`)
`LOCALBASE`	The base of the ``local'' tree (e.g., `/usr/local/`)
`X11BASE`	The base of the ``X11'' tree (e.g., `/usr/X11R6`)
`PREFIX`	Where the port installs itself (see more on `PREFIX`).

Note: If you have to define the variables USE_IMAKE, USE_X_PREFIX, or MASTERDIR, do so before including bsd.port.pre.mk.

Here are some examples of things you can write after bsd.port.pre.mk:

    # no need to compile lang/perl5 if perl5 is already in system
    .if ${OSVERSION} > 300003
    BROKEN= perl is in system
    .endif
    
    # only one shlib version number for ELF
    .if ${PORTOBJFORMAT} == "elf"
    TCL_LIB_FILE=  ${TCL_LIB}.${SHLIB_MAJOR}
    .else
    TCL_LIB_FILE=  ${TCL_LIB}.${SHLIB_MAJOR}.${SHLIB_MINOR}
    .endif
    
    # software already makes link for ELF, but not for a.out
    post-install:
    .if ${PORTOBJFORMAT} == "aout"
           ${LN} -sf liblinpack.so.1.0 ${PREFIX}/lib/liblinpack.so
    .endif

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15.7 Writing something after bsd.port.mk

15.7 Writing something after `bsd.port.mk`