It will not be that easy.. I don't use gtkperf since a few time and every
single component of my graphic stack is pulled from git master. I recompiled
kernel 3.12 which doesn't work but maybe the working one was 3.11, I tried
downgrading glamor but X didn't start at all, maybe I needed to recompile
xf86-video-ati. It's a time consuming process, being able to enable some kind
of debug to have some hints would be preferable.