[CentOS] Upgrade GTK2 from 2.10 to 2.12 ?

Hi,

I'm using CentOS 5.3 on all my desktops, and I really like it. Now I'd 
like to build a few additional apps that aren't included in any third 
party repo. Some of them require GTK2 2.12 to build, so I'm considering 
a (careful) upgrade of this package.

General question: 1) how "safe" is it to upgrade this package? To do so, 
I'd use an SRPM from Fedora. 2) What could I possible "break" on a 
vanilla CentOS install by doing this?

Cheers from the sunny South of France,

Niki Kovacs