title: How to configure VSCode for GTK3 for intellisense / build / debug and g++
body: <p>I'm using</p>
  
  <ul>
  <li>g++</li>
  <li>GTK3</li>
  <li>VSCode</li>
  </ul>
  
  <p>How do I get the following to work:</p>
  
  <ul>
  <li>Intellisense / code completion for gtk</li>
  <li>Buiding inside VSCode</li>
  <li>Debugging with VSCode</li>
  </ul>
  
  <p>Problem:</p>
  
  <p>VSCode does not find includes - especially <code>#include &lt;gtk/gtk.h&gt;</code> is red in source.</p>