https://bugs.freedesktop.org/show_bug.cgi?id=92301
--- Comment #9 from Michel Dänzer michel@daenzer.net --- (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.