GD is part of PHP 4.3.x. If you can snag an RPM for RedHat (Check
RPMFind.net), that will most likely be the simplest way to upgrade your PHP.
You can do this all via command line, as well, though I am not terribly
knowledgeable about command-line RPMing, to guide you through which options
you sho
Are you using the 'default' setup from Red Hat (ie. RPMS)? If so, I
(also using RH 7.2 ... completely modified at this point) found it
easier to rip everything out (PHP, apache, SSL, mysql, etc) and install
everything by hand (via source). Although it took me a while (hacking
at it now and again)