try this:
create a new page called info.php. then add this code:
<?php
phpinfo();
?>
make sure that it is in your ~/Sites directory somwhere. then,
navigate to it. it will list everything that is compiled in. if GD
isn't there, i think Marc Lyniage's (entropy.ch) verison of php has it
pre-compiled.
rob
Basically you need to rebuild PHP, replacing your old PHP. On Mac OS
X, there's the easy way, and the hard way:
(1) EASY
see Mark Liyange's package installer, which will install and rebuild
PHP for you using the Mac OS X Installer.
http://www.entropy.ch/software/macosx/php/
Fortunately for you, he's already included GD support in the package.
(2) HARD
- rebuild PHP manually, using command-line. You'll have to find
yourself instructions on how to to build PHP with GD support-- I
believe they are somewhere on developer.apple.com or Apple's support
site -- it requires you to get intimate with the PHP rebuilding
process in Terminal, may or may not be intimidating and/or worth-it.