The way to filter out unwanted requirements nowdays is to use %filter_from_requires according to https://fedoraproject.org/wiki/Packaging:AutoProvidesAndRequiresFiltering When I do my regular builds and mock builds this works fine.  But when I tried to do a plague build it fails:    error: line 28: Unknown tag: %filter_from_requires /perl(m2vmp2cut)/d    error: query of specfile m2vmp2cut.spec failed, can't parse In my own environment, the macro is defined in /usr/lib/rpm/redhat/macros, part of redhat-rpm-config-9.1.0-5.fc14.noarch. Is this my error?  If so, what do I do wrong?  Or is it something broken in the build environment? When doing the cvs-import I got a Python traceback, as just reported in a separate mail.  It does seem a bit far fetched that there would be a connection between these two errors.  But you never know!