I also have this problem and search for a solution. I think this is Qt's bug, not KDE's. The key must be added to qt4/QtCore/qnamespace.h so that is can be recognized by a Qt program.
I also have this problem and search for a solution. I think this is Qt's bug, not KDE's. The key must be added to qt4/QtCore/ qnamespace. h so that is can be recognized by a Qt program.