Comment # 9 on bug 92301 from Michel Dänzer

(In reply to MC Return from comment #8)
> I noticed it reports GPU: Gallium 0.4 on AMD HAWAII (DRM 2.43.0, LLVM 3.6.2)
> 3.0 Mesa 11.1.0-devel (git-e413d2f 2015-09-28 vivid-oibaf-ppa) [...]

It's using the system 32-bit binaries (apparently left over from the oibaf PPA,
about one week old snapshot of Git master), because you haven't built any
32-bit binaries yourself.