Trinity can't see gtk-qt-engine

I'm running Trinity R14.0.4 on OpenSuSE Leap 42.2. Trinity Control Center reports that gtk-qt-engine is not installed, but YaST reports that it is. (See attachments.) This impairs use of some GTK-based applications. I'm not sure how to diagnose this further. Leslie -- A Caution to Everybody Consider the Auk; Becoming extinct because he forgot how to fly, and could only walk. Consider man, who may well become extinct Because he forgot how to walk and learned how to fly before he thinked. -- Ogden Nash