(In reply to comment #3)
> I managed to build x86_64 mesa, but it broke steam and Metro:LL which are
> 32-bit apps.

Weird, the 64 bit binaries normally shouldn't have any effect on 32 bit apps.
What's the breakage?

> Is there any guide for building i386 mesa? I get the following error:
> 
> /usr/bin/ld: cannot find -ldrm_intel
> [...]

Looks like the lib*.so symlinks are missing for the 32 bit libraries (located
probably in /usr/lib/i386-linux-gnu/). If you can't install the corresponding
32 bit development packages, you can create the symlinks manually.