title: Anaconda Python: How to install missing dependency?
body: <p>I am trying to install <code>graph-tool</code> from here: <a href="http://anaconda.org/vgauthier/graph-tool" rel="noreferrer">http://anaconda.org/vgauthier/graph-tool</a>, using the command mentioned on that page.</p>
  
  <p>I used the given command line:</p>
  
  <pre><code>conda install -c http://conda.anaconda.org/vgauthier graph-tool
  </code></pre>
  
  <p>and I get the following error:</p>
  
  <blockquote>
    <p>Error: Could not find some dependencies for graph-tool: pixman</p>
  </blockquote>
  
  <p>So I tried to install <code>pixman</code> in a similar way: <a href="http://anaconda.org/rwest/pixman" rel="noreferrer">http://anaconda.org/rwest/pixman</a>.  </p>
  
  <pre><code>conda install -c http://conda.anaconda.org/rwest pixman
  </code></pre>
  
  <p>This succeeded.</p>
  
  <p>Yet the "could not find dependency" error is still there when trying to install <code>graph-tool</code>.  Why does this happen and how can I fix it?  There is no additional error message that I could go on.</p>