Feature file (.prf) not being used

[chrisco]

The Qt version i'm running does not seem to use the Features (.prf) i place in QTDIR/mkspecs/features

I have the following in my application:
CONFIG += uiframework

And a file QTDIR/mkspecs/features/uiframework.prf with the config for the uiframework

Anybody have a clue why this is occurring? And how to fix this?