title: QT needs a compiler set up to build
body: <p>Operating system is ubuntu 12.04. I have downloaded and installed QT 5.0.2 (64bit linux). Then when I try to debug something, it says<br>
  :-1: error: Qt Creator needs a compiler set up to build<br>
  Configure a compiler in the kit options.
  I've already installed mingw but QT doesn't auto-detect it. (I don't know even if it is supposted ro do that).</p>