title: Compile Qt5 without GUI support on Linux ARM
body: <p>I'm having troubles getting Qt5 working without GUI elements on my Cortex-A9 board due the OpenGL dependencies (i.e. OpenGL ES2). I am running a Ubuntu 14.04 rootfs.</p>
  
  <p>Is there any way to disable the generation of GUI classes, starting from git repository? (Target version 5.3).
  The only modules I need are QtCore, QtXML and QtWebSockets/QtNetwork</p>