[CentOS] Help making gnokii (cvs version) rpm for CentOS 5

Hi, I'm trying to package gnokii (using FC6 SRPM as base).
I can build it without problems, my problem is that I want to upgrade it
from CVS version.

I download the cvs version (from cvs, because "current" tar.gz appears to
be broken) but ... ¿How can I convert this CVS version to a "peseudo
release" to make a diff from 0.6.14 and add the patch into the SOURCES?

Thanks