1. Make a kit using Qt 5.2.1 your default kit.
2. Open the project demos/declarative/samegame/samegame.qmlproject from Qt4’s repository.
   It will be automatically configured to use the kit from step 1.
3. Try running the project.
   It fails with the following application output:

   Starte /home/qtrob/dev/bin/qt-5.2.1/qtbase/bin/qmlscene...
   qmlscene: 'import QtQuick 1.1' is no longer supported.
   Use qmlviewer to load file '/home/qtrob/dev/src/qt-4.8.6/demos/declarative/samegame/qml/samegame/samegame.qml'.
   /home/qtrob/dev/bin/qt-5.2.1/qtbase/bin/qmlscene beendet, Rückgabewert 0
   

4. Select "qmlviewer" in Projects mode.
5. Try running the project.
   Now it works.

qmlviewer should be selected automatically when opening a Qt Quick 1 UI project.