title: updating octave: linking the installation
body: <p>I have <code>OSX 10.10.5</code> with Octave <code>3.4.0</code> running (installed, who knows how, I did it a million different ways through port, file extraction, ftp, homebrew…). I tried to update my Programme (<code>brew install octave</code> or <code>sudo port install octave</code>) and Terminal spits out:</p>
  
  <p><code>Warning: octave-3.8.2 already installed, it's just not linked</code></p>
  
  <p>Okay, great. So I have a better programme somewhere installed. What now? How on earth am I supposed to “just <strong>link</strong>” the newer installation?</p>