CodeWarrior 6.2 for Coldfire, ex****t to GNU Makefile?

I've got an evaluation copy of CodeWarrior 6.2 for a Coldfire board 
(M5475EVB) along with some example code for the board and I was hoping 
to be able to generate a GNU Makefile from the CodeWarrior project files 
- however when I try this I get:

"Couldn't ex****t the makefile because either the linker rules sup****t 
files (*.lrf) were missing, or an error occurred while parsing them."

Seeing as I can't find any .lrf files, I assume the lack of them is the 
source of the problem.

Any idea what I need to do?

Thanks

David