title: How to set libs order in qmake?
body: <p><br>
  We have a problem building out C++ software on Ubuntu Linux with qmake. <br>
  Problem is: we use some library, for example OpenCV, that can have different versions in one system. <br>
  qmake automatically add -L/usr/lib or -L/usr/lib/x86_64-linux-gnu to g++ arguments, and contents of LIBS variables after it. <br>
  So there conflicts with different versions of OpenCV, the system version is used, but we need custom one, located at our build tree. 
  Are there any methods to change libs order in -L or something else to solve this problem?</p>