I downloaded octave version 4.2.1 as instructed here <http://wiki.octave.org/Octave_for_macOS>, and I am able to run Octave from the terminal. However, I cannot launch Octave using GUI. When I add the command `--force-gui`, nothing happens. 

I have tried `brew reinstall octave --with-qt --with-fltk --with-gui`, which does not help. 

Any ideas?

Thank you