title: Python Image Library fails with message "decoder JPEG not available" - PIL
body: <p>PIL does support JPEG in my system.</p>
  
  <p>Whenever I do an upload, my code is failing with:</p>
  
  <pre><code>File "PIL/Image.py", line 375, in _getdecoder
      raise IOError("decoder %s not available" % decoder_name)
  IOError: decoder jpeg not available
  </code></pre>
  
  <p>How can I resolve this?</p>