(In reply to Vladimir Ysikov from comment #20)
> I rebuild llvm-svn, mesa-git with debug symbols and get this: 
> 
> behem0th@ArchLinux ~ $ glxinfo 
> name of display: :0
> Error: couldn't find RGB GLX visual or fbconfig

Looks like something went wrong when updating LLVM / Mesa. Please attach the
corresponding Xorg.0.log file.