I was told to report this by portage, so : * If you have just updated your major Perl version (e.g. from 5.20.2 to 5.22.0), * and have run perl-cleaner _after_ that update, then this means most likely * that these packages are buggy. Please file a bug on http://bugs.gentoo.org/ and * report that perl-cleaner needed to reinstall the following list: * perl-core/Module-Metadata:0 virtual/perl-Module-Metadata:0 perl-core/JSON-PP:0 virtual/perl-JSON-PP:0 perl-core/CPAN-Meta:0 virtual/perl-CPAN-Meta:0 net-fs/samba:0 As a matter of fact, I just upgraded from 5.20.2 to 5.22.2. I'm running a 64bits kernel 4.4.6 from sys-kernel/gentoo-sources.
After emerge --depclean, portage removed : - perl-core/CPAN-Meta - perl-core/Module-Metadata - perl-core/JSON-PP - virtual/perl-CPAN-Meta-Requirements Looks like I should have done that before calling perl-cleaner...