https://bugs.freedesktop.org/show_bug.cgi?id=71516
--- Comment #8 from Michel Dänzer michel@daenzer.net --- (In reply to comment #7)
printenv | grep ALWAYS LIBGL_ALWAYS_SOFTWARE=0
LIBGL_ALWAYS_SOFTWARE forces software rendering regardless of its value. You need
unset LIBGL_ALWAYS_SOFTWARE
instead, or just don't set it in the first place.
So, why does unity_support_test fail without LIBGL_ALWAYS_SOFTWARE set?