title: Project ERROR: Unknown module(s) in QT: websockets
body: <p>I'm trying to run a simple client example using QTWebsockets using Qt Creator, already add the </p>
  
  <pre><code>QT       += websockets
  </code></pre>
  
  <p>But it throws this when i run build or qmake</p>
  
  <pre><code>:-1: error: Unknown module(s) in QT: websockets
  </code></pre>
  
  <p>I tried </p>
  
  <pre><code>QT       += core websockets
  </code></pre>
  
  <p>Then realized that since installed Qt Creator from the repositories it wasn't up to date, so I reinstalled it from the Qt website but the problem persisted, I then ran pkg-config --modversion QtCore and it returns 4.8.6, thing is, in the QT version tab of qt creator it shows 5.4.1 to GCC compiler which is the compiler I’m using, in /opt/Qt/5.4/gcc_64/lib there is the QT5WebSockets module even in the help tab are listed the QT5 modules but I can't use them.</p>
  
  <p>Tried with SerialPort and it didn't work, tried with Opengl and it worked which means is a version problem but I can't seem to find how to solve.</p>