Hi,
Sort of falling into this thread mid way, but I had an issue failing to build the RHEL6 glibc rpm on RHEl6beta due to unpackaged debug files. Reported this as a bug: https://bugzilla.redhat.com/show_bug.cgi?id=653905 .
Adding
%_enable_debug_packages 1
to .rpmmacros fixed the packaging issue for this package. Might work for other builds that fail due to unpackaged files too.
Regards, Leonard.