Could you add link to old filtering of provides/requires for EPEL-5 to [1]?
I couldn't find the old howto and on this page is mentioned only we need to conditionalize macro, which didn't help if you don't know how.
[1] https://fedoraproject.org/wiki/Packaging:AutoProvidesAndRequiresFiltering
The material is now available here: https://fedoraproject.org/wiki/EPEL:Packaging#Perl_Provides_and_Requires_Filtering
A link has been added in the "Rationale" section to point to the EPEL section.