This bug report helped me track down how to compile the OpenGL module. While the compiler error and fix for Scientific Linux (RHEL / CentOS) was different, than the one listed, the process was the same.
Additionally, this bug was not encountered with the initial 6.3, but only when I updated. My system information is as follows:
[root@localhost ~]# uname -a
Linux localhost.localdomain 2.6.32-358.2.1.el6.x86_64 #1 SMP Tue Mar 12 14:18:09 CDT 2013 x86_64 x86_64 x86_64 GNU/Linux
[root@localhost ~]# lsb_release -a
LSB Version: :core-4.0-amd64:core-4.0-noarch:graphics-4.0-amd64:graphics-4.0-noarch:printing-4.0-amd64:printing-4.0-noarch
Distributor ID: Scientific
Description: Scientific Linux release 6.3 (Carbon)