portupgrade -f \
`
 ( pkg_info -R perl-5\* \
   | tail +4; \
   find /usr/local/lib/perl5/site_perl/5.[68].[1245] -type f -print0 \
   | xargs -0 pkg_which -fv \
   | sed -e '/: ?/d' -e 's/.*: //' \
 ) \
 | sort -u
`