title: C1083: Cannot open include file: 'QPushButton' with cmake and qt
body: <p>My cmake:</p>
  
  <pre><code>set(QT_VERSION_REQ "5.11.0")
  find_package(Qt5 COMPONENTS Core Quick Widgets REQUIRED)
  </code></pre>
  
  <p>My includes:</p>
  
  <pre><code>#include &lt;QGuiApplication&gt; //ok
  #include &lt;QQmlApplicationEngine&gt; //ok
  #include &lt;QPushButton&gt; // &lt;&lt;==  fails!!
  </code></pre>
  
  <p>What am I missing in my cmake?</p>