title: How to make Octave use "gnuplot" instead of "fltk" by default?
body: <p>I'm using Octave 3.8 on Ubuntu 13.10 and "fltk" for graphics is not working well. So I always switch to "gnuplot" by commanding:</p>
  
  <pre><code>graphics_toolkit("gnuplot")
  </code></pre>
  
  <p>How can I configure Octave to use "gnuplot" by default?</p>