The bootstrap_coreFUE product has been superceded by the bootstrap product, which is a much more highly automated set of scripts for installing ups, upd, perl, and a user-configurable list of other products onto a system for the first time.
For historical purposes only, you can still read the last release of the bootstrap_coreFUE documentation; but please remember, it is obsolete and should not be used as an installation guide.
Questions? Send them to helpdesk@fnal.gov.