SquirrelMail has not been extensively tested for use with PHP 4.3.x.
See the ReleaseNotes file.
- Point your favorite webserver at http://www.php.net/version4/ and
+ Point your favorite web browser at http://www.php.net/downloads.php/ and
download the source. Untar (tar xvfz filename-you-downloaded.tgz)
the source, cd into the directory and run configure. To make PHP4
work with SquirrelMail a commandline like this should do: