Yeah, someone really dropped the ball here. If you see this when you try to yum install gcc:
--> Finished Dependency Resolution
Error: Package: glibc-headers-2.12-1.80.el6_3.7.x86_64 (updates)
Requires: kernel-headers
Error: Package: glibc-headers-2.12-1.80.el6_3.7.x86_64 (updates)
Requires: kernel-headers >= 2.2.1
You could try using --skip-broken to work around the problem
You could try running: rpm -Va --nofiles --nodigest
Then try doing this: sudo yum --disableexcludes=main install kernel-headers-*.el6.openlogic.x86_64
I don't know who's the idiot who put exclude=kernel* in /etc/yum.conf to break installing gcc, but...you're an idiot.