title: C++ Qt - QTcpSocket - File not found
body: <p>I am using <code>Qt</code> and <code>QTcpSocket</code> to create a small chat client/server application.</p>
  
  <p>When I compile my code, the compiler returns the following error:</p>
  
  <pre><code>main.cpp:3:22: fatal error: QTcpSocket: No such file or directory
  </code></pre>
  
  <p>This refers to <code>#include &lt;QTcpSocket&gt;</code>.</p>
  
  <p>Where is this library located and how can I install it?</p>