I'm over here trying to rebuild php with GD in WHM, I go through the entire motion of Apache Update (with GD selected as a PHP Module) and ummmm... after it's done, I check my phpinfo() and there is no GD section, let alone has the build date been changed.
When debugging issues, you need to have the option for verbose compiles enabled. To get there (from the shell):
6(advanced for experts only)
the last option
Keep in mind (of course) that you don't need to rebuild apache to rebuild php. Of course you can rebuild php in and of itself.
As well, it's entirely possible you have conflicts with php. This would be caused, say, if you have a redhat server with a php rpm and a cpanel server with php compiled. Remove the rpm, it's not necessary, or recommended.
WHMCS Guru - WHMCS addons, management, support and more. WHMCS Notifications Extended - Add slack, hipchat, SMS, pushover to WHMCS !!
Linux Problems? WHMCS Issues? +1-866-546-8914 (linux-14) or @whmcsguru on twitter!