As per summary -- perl-cleaner at times does not play nice with systems that are only partially use subslot dependencies. Please bump this package to EAPI5 via revbump so that anyone upgrading perl will get this package rebuilt now, and automatic rebuilds will be triggered via subslots in the future. Note that a stable revbump is acceptable for this assuming no other changes are necessary to the ebuild (and it doesn't look like there would be).
too lazy, do it yourself
Done. Thanks!