title: Retina support in Qt5 on OS X
body: <p>I'm writing a C++ graphical application using Qt 5.5.0 on OS X El Capitan on a Retina MacBook Pro. Text is pixelated throughout the application so I suspect that high DPI mode is not used. My Info.plist contains the following definition:</p>
  
  <pre><code>&lt;key&gt;NSHighResolutionCapable&lt;/key&gt;
      &lt;true/&gt;
  </code></pre>
  
  <p>How do I enable high resolution mode (especially for text rendering) in a Qt application on OS X?</p>