php gd extension with cPanel

Hello,

I'm hoping there's an easy fix for this. I've got a centos server
machine 6.4 I believe with cPanel running on it. I need to enable the
gd extension, both the gd and gd-devel rpm packages are installed, but
php is not, that is showing up in a package list. It is however
installed as it's gone through cPanel. It does not however have the
php-gd extension. I am wondering if there's an easy way to get this
extension working? I do not want to have to recompile the whole php to
do this.

Thanks.
Dave.