Autogenerating rpm requirements from egg requirements

I ran into a problem with TurboGears packaging in EPEL5 where requirements in the requires.txt file in the egginfo subdirs were getting bumped upstream but without corresponding bumps in the rpm packaging, leading to yum failing to do all the upgrading I needed (filed as bug 451228 and 451231 so far). Has anyone tackled this problem? I had a go at trying to autogenerate the RPM metadata, I've attached my work-in-progress so far to bug 451228: https://bugzilla.redhat.com/attachment.cgi?id=309225 Thoughts? Worth finishing and turning into something in a common location for rpmbuild? Dave