title: How come Xcode doesn't automatically link with QuartzCore when the project uses it?
body: <p>I am somewhat curious for iOS apps development with Xcode, even though we specifically state:</p>
  
  <pre><code>#import &lt;QuartzCore/QuartzCore.h&gt;
  </code></pre>
  
  <p>in our <code>ViewController.h</code>, when the project is linked, the <code>QuartzCore</code> library is not automatically linked.  Why is that?</p>