Comment # 8 on bug 71516 from Michel Dänzer

(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?