Hi,
GD support needs to compiled into PHP, which means PHP needs to be re-configured once GD has been installed on the base system.
What distribution of linux are you running. Start by:
1) looking for GD packages* for your distro.
2) Download and install**.
- If you cannot find packages, download the source and install it.
** The config example (below) assumes png, jpg and freetype are present and installed / linked correctly.
3) Re-configure php and add the following lines:
--with-gd=/path \
--with-freetype-dir=/path-to-dir \
--enable-gd-native-ttf \
--enable-gd-imgstrttf \
--with-jpeg-dir=/path-to-dir \
--with-png-dir=/path-to-dir \
--whatever-else-you-need
Your system administrator will obviously have to give you root access to get this done.
It's recommended you get packages as GD install gets a bit hairy if things go wrong. It's not simply a matter of re-installing it, you have to completely remove the existing install, tracking what files went where.
good luck.
-m.