title: Forcing specific version of QT in .pro file
body: <p>I'm searching for a way to force a specific version of QT in a .pro file. To be more specific, I'd like to force <code>qmake</code> to use only QT 5.x version with my project instead of QT 4.x and QT 5.x</p>
  
  <p>Is there a way to do so?</p>
  
  <p>PS: I'm not asking for a way to stop/halt the compile process (aka check QT version, and if lower than 5.x just throw qFatal/equivalent). I'm looking for a way to actually <em>choose</em> which version to use while generating the <code>Makefile</code> with <code>qmake</code></p>