Comment # 23 on bug 1156 from Robert-André Mauchin

 - Use desktop-file-validate

 - Consider adding an Appdata file. See:
https://fedoraproject.org/wiki/Packaging:AppData Don't forget to validate it if
you do.

 - Build fails with:

make[2]: Leaving directory '/builddir/build/BUILD/performous-1.1/build'
BUILDSTDERR: make[2]: *** No rule to make target 'opencv_calib3d-NOTFOUND',
needed by 'performous'.  Stop.
BUILDSTDERR: make[2]: *** Waiting for unfinished jobs...