adnphllps

Since qt changed their naming to include the version, one fix is to cd into your _pkgconfig_ directory (maybe _/usr/lib/x86_64-linux-gnu/pkgconfig_) make sure the file Qt5Widgets is there, then run: _sudo...

I had the same issue. The problem is that some of the training images in the train2014 set were corrupted. I had to delete three files, after which the error...

I think you didn't run: > make > make install before running: > sudo python setup.py install