Hello,
As reported on https://bugs.debian.org/1118277 , « pocketsphinx includes gst/livedemo.py which seems to rely on pygtkcompat. pygtkcompat was a transitional mechanism for porting from pygobject 2 to pygobject 3, and the pygobject developers removed it
after the 3.50.x release series. »
Samuel