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How to get rid of ruby-2.0 on Gentoo
As per this Gentoo News Item Ruby 2.0 has been removed. Unfortunately it may still linger on your system until you manually intervene and remove all dependencies to it.
# equery l ruby * Searching for ruby ... [IP-] [ M] dev-lang/ruby-2.0.0:2.0 [IP-] [ ] dev-lang/ruby-2.1.9:2.1 # eselect ruby list Available Ruby profiles:  ruby20  ruby21 (with Rubygems) * # emerge -1Oav virtual/rubygems dev-ruby/rubygems rdoc racc rake dev-ruby/json # emerge --depcleanIf that still doesn't automatically remove ruby:2.0 then you can forcibly uninstall it:
# emerge -C ruby:2.0Then depclean will tell you which packages you should rebuild to clear the remaining dependencies to that version.