For some reason to be investigated there is a custom pbs-config in the Fedora and EPEL packages. This does not support in particular pbs-config --libdir I expect this is now historical from the early introduction of x86_64 as alternate architecture being introduced.
Fixed next release f15 release: * Wed Dec 8 2010 Steve Traylen <steve.traylen> - 2.5.3-3 - Remove own copy of pbs-config. #657027 - Move man pages from doc subpackage to relavent sub package. - Enable drmaa support and add drmaa sub packages.