title: Set QT base directory through system variable
body: <p>I've compiled QT and copied it over to a network drive. But now I've got the problem that the platform plugins are only found on my computer because it seems that those path got compiled into the binaries. How can I make QT to look into another directory? I thought that the system variable <code>QTDIR</code> should work but it gets ignored completely. Also tried to add a bunch of directories to the <code>PATH</code> variable which didn't work either. </p>
  
  <p>I need a solution which is useable without changing the code itself.</p>