(In reply to comment #7)
> That's the standalone glamor tree. I mean glamor from the current xserver
> Git tree.

Can/should I build glamor separately or should just build the whole xorg-server
from git?

> Anyway, I think the attached backtrace can only happen if Steam uses GLX
> indirect rendering (current versions of Steam present a warning dialog on
> startup when that's the case).

Yeah, I'm aware there are some ABI issues on Arch Linux with Steam's bundled
libgcc_s.so.