Thanks for your answer, but why do I need the QT debug symbols? As I said, I don't want to debug QT. I am unsure about the backtrace, perhaps they come in handy there.
I think it's a qmake thing. Even with CONFIG += debug it should allow to link against the normal QT library, and probably should do so by default.

I need the QT3 stuff, cause I've not yet ported every part of my application to QT4.

Best regards

Ben