Bug#498573: libqt4-dev: Please, enable Phonon support
thank you Sune for your reply. I'm very sorry I didn't answer earlier.
I've tried again building the musicplayer example from the Qt4 examples.
It builds but it doesn't work. I'm getting error messages of this kind:
Phonon::createPath: Cannot connect Phonon::MediaObject(no objectName) to
WARNING: bool Phonon::FactoryPrivate::createBackend() phonon backend
plugin could not be loaded
Unfortunately, the example isn't build in qt4-demos either.