It discovered that timers has 4.0.x and 4.1.x series. It is clear from the changelog file. A software such (as rubydns) might explicitly depend on a specific slot such as ~> 4.0.1. Currently, both versions are slotted under :4. I suggest to adjust slots to: :4.0 :4.1 For more details, see the following: https://bugs.gentoo.org/show_bug.cgi?id=582556
Our policy for slotting is outlined here: https://wiki.gentoo.org/wiki/Project:Ruby/Packaging_RubyGems#Version_numbers_and_slots From the timers Changelog I don't see any backward-incompatible changes, so in this case the best approach is to fix the rubydns gemspec.
Ok, agreed. The API may be still compatible. Thanks for looking at it.