title: fatal error: QtGui/QApplication: No such file or directory
body: <p>I'm using Qt Creator, and this line is generated automatically by the Qt Creator:</p>
  
  <p><code>#include &lt;QtGui/QApplication&gt;</code></p>
  
  <p>But, why am I getting this message?</p>
  
  <p><code>QtGui/QApplication:  No such file or directory</code></p>