title: Qt 5.2.1 how to reconfigure?
body: <p>When I configure Qt 5.2.1 the makefile says that you should run <code>make confclean</code> if the configuration should be changed. <code>confclean</code> no longer exists, and using google I found some postings which confirm this. I don't have GIT and using <code>make clean</code> also doesn't help.</p>
  
  <p>Now I wanted to change the installation prefix but even after <code>make clean</code> the path is still the old one, even though configure claims that it is the new one, but after building is finished it still installs in the old path.</p>
  
  <p>I now deleted the whole package and copied the entire clean sourcetree from scratch, so I can build with a clean version again, but this seems a big waste of time.</p>
  
  <p>I'm using the opensource build compiling wiht MingW64, so how do I properly do this?</p>