The problem with this ebuild was that Attribute-Handlers would install in your perl5/site_perl instead of perl5/, thus the core module for perl-5.8.0 never gets updated. I have sed'd the Makefile.PL to rectify this situation. I do not know if this is appropriate for perl-5.6.1.
Created attachment 6668 [details] Attribute-Handlers.tar.bz2
Similar fix applied as 0.78-r1. Thanks for the suggestion.