[gentoo-user] ruby 22

[allan gottlieb]

I am currently running ruby21 (ruby-2.1.9).
All such versions of ruby are masked so this is clearly a mistake
on my part.  I was alerted to this error by dev-ruby/rdoc-4.2.0
failing to build on today's emerge --update @world

After I do
  eselect ruby set ruby22
can I simply
  emerge --update @world
or must I explicitly rebuild some ruby packages?

Thanks,
allan