chruby : Small script for changing current Ruby version in shell. ( https://github.com/postmodern/chruby )
ruby-install : Installs [Ruby], [JRuby], [Rubinius], [MagLev] or [mruby]. ( https://github.com/postmodern/ruby-install )
Add an ebuild in portage :
The ebuild is now in the portage tree.
You can also use layman : emerge layman then layman -a ag-ops
For Paludis use this rsync : rsync://gentoo.zugaina.org/ag-ops-portage
If you have a problem : ycarus(-at-)zugaina.org