1) remove purge cantor installation
2) check, that `cantor-initmaxima.lisp` have be removed from `share/cantor/maximabackend`
3) reinstall cantor without the patch
4) check, that `cantor-initmaxima.lisp` don't be contained in `share/cantor/maximabackend`
5) check, that maxima backend don't calculate
6) apply patch and reinstall cantor
7) check, that `cantor-initmaxima.lisp` exist in `share/cantor/maximabackend`
8) check, that maxima work normally