Comment # 8 on bug 1087903 from Stefan Dirsch

libGL.so.1 was referring to libGL.so.1.2.0, an ancient Mesa libGL (not being
owned by any package any longer) instead of libglvnd's libGL.so.1.0.0 wrapper.
Manually fixed on the system. IIRC this was an interim problem for TW users.
Last time I stumbled across this was about 1 year ago I believe. CLosing as
fixed.