title: Homebrew R build missing Cairo
body: <p>I installed R on an OSX 10.7.5 server using brew:</p>
  
  <pre><code>brew install R
  </code></pre>
  
  <p>Everything seems so OK far, however Cairo is not working:</p>
  
  <pre><code>&gt; svg(tempfile())
  Warning messages:
  1: In svg(tempfile()) :
    unable to load shared object '/usr/local/Cellar/r/2.15.2/R.framework/Resources/library/grDevices/libs//cairo.so':
    dlopen(/usr/local/Cellar/r/2.15.2/R.framework/Resources/library/grDevices/libs//cairo.so, 6): image not found
  2: In svg(tempfile()) : failed to load cairo DLL
  </code></pre>
  
  <p>The shared object file seems to be missing completely: </p>
  
  <pre><code>id-86-243:Resources jeroen$ ls -ltr library/grDevices/libs/
  total 488
  -rwxrwxr-x  1 jeroen  admin  245764 Dec 22 17:03 grDevices.so
  </code></pre>
  
  <p>I rarely use OSX, so I am not quite sure if this is a bug in this particular distribution of R, or if I have done something wrong when building it?</p>