Originally posted by the_php_guy
try to take a look at your php.ini and make sure that
extension=php_gd2.dll
is uncommented.
That only applies to windows installs. If you read the last post by checksum, he clearly states he runs linux.
In a *nix environment, make sure it's:
extension=php_gd2.so
However, if you compile you own PHP, there's no need to bother with any of that php.ini crap.