http://people.redhat.com/wtogami/temp/perl-Bit-Vector-549333-x86_64-thor.perf.redhat.com.log Failure on x86_64, maybe other archs too.
> Warning: prerequisite Carp::Clan 5.3 not found. Carp::Clan was split into a separate CPAN dist in upstream Bit-Vector 6.4, so apparently the options are to leave Bit-Vector at 6.3, patch 6.4 to not require Carp::Clan, or to not patch Bit-Vector 6.4 but include perl-Carp-Clan in FC and BuildRequire it in Bit-Vector. IIRC Jose mentioned some other module updates would require Carp::Clan too? If this is the case and if it's still possible for FC4, I'd go for the Carp-Clan inclusion option.
Thanks Ville and jpo. Fixed in rawhide with jpo's packages.