First, a warning:
servers are fragile. If you have important apps/sites on this server, don't risk it unless you have the means to fix it.
It's faster, safer, and more secure to launch a new VPS with Ubuntu and install only the delegate there.
I'm in this process myself atm and can confirm that the wiki guide (while a little messy) is error-free.
But if you want to live on the wild side
, I'd run
yum update. That should fix the GCC error.