Comment 2 for bug 821100

Also,
manually creating the /usr/lib32/libGL.so.1 symlink is not enough here
as several libraries are either missing or not found by ldd, preventing my dri drivers from being loaded:

$ ldd /usr/lib32/dri/r600_dri.so
 ...
 libdricore.so => not found
 libglsl.so => not found
        ...
 libgallium.so => not found
 libLLVM-2.9.so.1 => not found
 ...

libdricore.so, libglsl.so and libgallium.so are installed under /usr/lib32/dri/ but not found
libLLVM-2.9.so.1 is missing