dev-perl/MaxMind-DB-Reader-1.0.14 should RDEPEND on dev-perl/Moose, since without that package installed mmdb-dump-metadata from this package fails to run: $ mmdb-dump-metadata -file GeoLite2-City.mmdb > Can't locate Moose.pm in @INC (you may need to install the Moose module) (@INC entries checked: /etc/perl /usr/local/lib64/perl5/5.40/x86_64-linux-thread-multi /usr/local/lib64/perl5/5.40 /usr/lib64/perl5/vendor_perl/5.40/x86_64-linux-thread-multi /usr/lib64/perl5/vendor_perl/5.40 /usr/lib64/perl5/5.40/x86_64-linux-thread-multi /usr/lib64/perl5/5.40) at /usr/lib64/perl5/vendor_perl/5.40/Moo/HandleMoose.pm line 64. dev-perl/Moo (which owns Moo/HandleMoose.pm) does not depend on dev-perl/Moose either. With dev-perl/Moose installed mmdb-dump-metadata works correctly.