title: Qt 5.2 version is not properly installed on Mac
body: <p>I recently tried to upgrade my Qt version to 5.2, so I uninstalled my previous version (using the MaintenanceTool.app), and downloaded and installed the latest version. That completely broke it, though. Whenever I try to build a project, it says:</p>
  
  <pre><code>The Qt version is invalid: Qt version is not properly installed, please run make install.
  </code></pre>
  
  <p>And when opening an example project, it says in the General Messages:</p>
  
  <pre><code>Error while parsing file /Users/thisuser/Qt/5.2.0/5.2.0/clang_64/examples/gui/analogclock/analogclock.pro. Giving up.
  Could not find qmake configuration file default.
  Cannot read /usr/local/Qt-5.2.0/mkspecs/macx-clang/qmake.conf: No such file or directory
  Could not read qmake configuration file /usr/local/Qt-5.2.0/mkspecs/macx-clang/qmake.conf.
  Project ERROR: Unknown module(s) in QT: gui core
  Project ERROR: Unknown module(s) in QT: gui core
  </code></pre>
  
  <p>I checked this path (<code>/usr/local/Qt-5.2.0/mkspecs/macx-clang/</code>) and indeed there is no such thing: there isn't even a <code>/usr/local/Qt-5.2.0</code> directory. I already uninstalled everything again and then installed it again, but that didn't help at all. Does anyone have any suggestions on what to do?</p>
  
  <p>My OS is OSX Lion.</p>