This package still uses ruby 2.1. Ruby 2.1 is no longer supported upstream and will be removed soon. Please update your package to use a newer ruby slot. Use ruby 2.2 if you can only use one slot and your package is in arch Use ruby 2.3 if you can only use one slot and your package is in ~arch Use as many ruby targets as possible when you can use multiple slots.
commit bf67d8f6e4d6a4b4852e9087005f23d5747126ea Author: Michał Górny <mgorny@gentoo.org> AuthorDate: Sun Aug 6 09:23:30 2017 Commit: Michał Górny <mgorny@gentoo.org> CommitDate: Sun Aug 6 11:36:42 2017 sys-apps/paludis: Switch to ruby2.2, #627144 Switched the stable to 2.2, ~arch is at 2.3 already (which will probably make it impossible to stabilize it, i guess).
(In reply to Michał Górny from comment #1) > Switched the stable to 2.2, ~arch is at 2.3 already (which will probably > make it impossible to stabilize it, i guess). Thanks! At the moment, yes. The intention is to start the ruby 2.3 stable bug as soon as ruby 2.1 is masked for removal. Current plan for this to happen is within a couple of weeks.