title: Installed Octave 4.2.1 with brew on MacOS; can't get it to run with a GUI
body: <p>I installed Octave on my macOS Sierra using Homebrew with the command</p>
  
  <pre><code>brew install octave
  </code></pre>
  
  <p>and everything installed fine.</p>
  
  <p>When I run Octave, however, it prints version 4.2.1, but I do not get the GUI nor can I force the GUI with <code>octave --force-gui</code>. No error message or warning is generated, the app just starts in the command line.</p>
  
  <p>How do I get Octave to run with a GUI?</p>