title: Can't install PIL after Mac OS X 10.9
body: <p>I've just updated my Mac OS to 10.9 and I discovered that some (all?) of my Python modules are not here anymore, especially the Image one.</p>
  
  <p>So I try to execute <code>sudo pip install pil</code>, but I get this error:</p>
  
  <pre><code>/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.9.sdk/usr/include/tk.h:78:11: fatal error: 'X11/Xlib.h' file not found
  
  #      include &lt;X11/Xlib.h&gt;
  
                 ^
  
  1 error generated.
  
  error: command 'cc' failed with exit status 1
  </code></pre>
  
  <p>My Xcode is up-to-date and I don't have any idea. Is it possible that PIL is not yet 10.9 compatible ?</p>