Thanks you to both (Sean and Gabriel) to help me with this problem.
Currently I'm not working with the CVS because the code I'd like to release should compile 
against/work with a release version (e.g. #13) and not a 'CVS beta' version. In the current version 
(#13) setColorStroke is not implemented.
Maybe I have to break up with this (short) tradition and use the CVS MASON version (if the next 
release will be available shortly).