title: How to load FLTK graphics toolkit in GNU Octave 3.8?
body: <p>I have installed GNU Octave 3.6.4 and 3.8.1 versions on one machine (OpenSUSE Linux 13.1, x86-64). Version 3.6.4 was out of the box, version 3.8.1 I build by myself from sources (configure-make-make install).</p>
  
  <p>In octave-3.6.4 I have such output:<br></p>
  
  <pre><code>octave-3.6.4&gt; available_graphics_toolkits
  ans = 
  {
    [1,1] = fltk
    [1,2] = gnuplot
  }
  octave-3.6.4&gt; loaded_graphics_toolkits
  ans = 
  {
    [1,1] = fltk
  }
  </code></pre>
  
  <p>In octave-3.8.1 I have gnuplot only:</p>
  
  <pre><code>octave-3.8.1&gt; available_graphics_toolkits
  ans = 
  {
    [1,1] = gnuplot
  }
  octave-3.8.1&gt; loaded_graphics_toolkits
  ans = 
  {
    [1,1] = gnuplot
  }
  </code></pre>
  
  <p><strong>How can I load the FLTK graphics toolkit?</strong>
  I try so:</p>
  
  <pre><code>octave-3.8.1&gt; register_graphics_toolkit("fltk")
  octave-3.8.1&gt; available_graphics_toolkits
  ans = 
  {
    [1,1] = fltk
    [1,2] = gnuplot
  }
  octave-3.8.1&gt; graphics_toolkit("fltk")
  error: __init_fltk__: not available without OpenGL and FLTK libraries
  error: called from:
  error:   /usr/local/share/octave/3.8.1/m/plot/util/graphics_toolkit.m at line 74, column 5
  </code></pre>
  
  <p>Why FLTK properly loads in octave-3.6.4 but doesn't in octave-3.8.1? How can I connect octave-3.8.1 to OpenGL and FLTK libraries?</p>