Здравствуйте!
Пытаюсь настроить связку SquirrelMail 1.4.13 и PostgreSQL (MySQL) на Debian 4.0.
Вывод configtest.php:

SquirrelMail configtest

This script will try to check some aspects of your SquirrelMail configuration and point you to errors whereever it can find them. You need to go run conf.pl in the config/ directory first before you run this script.

SquirrelMail version:    1.4.13
Config file version:    1.4.0
Config file last modified:    14 May 2008 10:18:42
Checking PHP configuration...
    PHP version 5.2.0-8+etch11 OK.
    display_errors: 1
    error_reporting: 6135
    variables_order OK: EGPCS.
    PHP extensions OK.
Checking paths...
    Data dir OK.
    Attachment dir OK.
    Plugins OK.
    Themes OK.
    Default language OK.
    Base URL detected as: https://MY_URL:8081/squirrelmail/src (location base autodetected)
Checking outgoing mail service....
    SMTP server OK (220 ESMTP)
Checking IMAP service....
    IMAP server ready (* OK [CAPABILITY IMAP4rev1 UIDPLUS CHILDREN NAMESPACE THREAD=ORDEREDSUBJECT THREAD=REFERENCES SORT QUOTA IDLE ACL ACL2=UNION STARTTLS] Courier-IMAP ready. Copyright 1998-2005 Double Precision, Inc. See COPYING for distribution information.)
    Capabilities: * CAPABILITY IMAP4rev1 UIDPLUS CHILDREN NAMESPACE THREAD=ORDEREDSUBJECT THREAD=REFERENCES SORT QUOTA IDLE ACL ACL2=UNION STARTTLS
Checking internationalization (i18n) settings...
     gettext - Gettext functions are available. On some systems you must have appropriate system locales compiled.
     mbstring - Mbstring functions are available.
     recode - Recode functions are unavailable.
     iconv - Iconv functions are available.
     timezone - Webmail users can change their time zone settings.
Checking database functions...
     PHP Pear DB support is present.
PREF_DSN=mysql://squirrelmail:dfhertqw@localhost/squirrelmail ADDRBOOK=mysql://squirrelmail:dfhertqw@localhost/squirrelmail

    ERROR: mysql database support not present!

Установлены следующие пакеты:
php-pear                   5.2.0-8+etch11                           PEAR - PHP Extension and Application Reposit

php-db                     1.7.6-2                                  PHP PEAR Database Abstraction Layer

Где утка зарыта?

Выручайте, товарищи!