How can I easily change preferences defined in a .prf file?

[pmed]

The file features/win32/default_pre.prf has rtti_off set by default. How can I change this behaviour from my project file? The .prf file seems to overwrite anything I put there.

Thanks for the help.

[ZapB]

As long as you set things after the .prf files have been processed your .pro file should override them. It can be tricky though since in some cases a .pro file can be processed up to 3 times by qmake.

As a last resort you could just edit the .prf file in question.