New comment by zdykstra on void-packages repository

https://github.com/void-linux/void-packages/pull/20220#issuecomment-601408825

Comment:
I was able to build / start this version of cropgui, but it's depending on `pygtk`, which drags in python2.7 and a few libraries. I removed `pygtk` from the depends, and I was still able to build / install / run it. 

pygtk only provides files for python2.7, so it should be safe to remove.