title: Can't load X11 in R after OS X Yosemite upgrade
body: <p>Running into the following error when I try to use ggplot2 and plot within the console after upgrading to Yosemite:</p>
  
  <pre><code>Error in (function (display = "", width, height, pointsize, gamma, bg,  : 
    X11 module cannot be loaded
  In addition: Warning message:
  In (function (display = "", width, height, pointsize, gamma, bg,  :
    unable to load shared object '/Library/Frameworks/R.framework/Resources/modules//R_X11.so':
    dlopen(/Library/Frameworks/R.framework/Resources/modules//R_X11.so, 6): Library not loaded: /usr/X11/lib/libSM.6.dylib
    Referenced from: /Library/Frameworks/R.framework/Resources/modules//R_X11.so
    Reason: image not found
  </code></pre>
  
  <p>How can I go about resolving this?</p>