Description of problem: perl-B-Keywords is part of rhel6 so it must be retired in epel6.
It's not available on all architectures and is therefore needed to satisfy dependencies on the architectures where it's not available directly in RHEL-6. This has been the case since EPEL-6 was started. See Bug #620421.
In this case package should have build with 0. prefix for release number but that's not fixable any more.
Indeed; this package pre-dates the introduction of the 0. prefix. At the time we went with a strategy of cloning the package from RHEL and building that.