Followup-For: Bug #830931 Similar problems in jessie:
GEM_PATH= ruby -e 'gem "ruby2ruby"'
/usr/lib/ruby/2.1.0/rubygems/dependency.rb:298:in `to_specs': Could not find
'ruby2ruby' (>= 0) among 8 total gem(s) (Gem::LoadError)
from /usr/lib/ruby/2.1.0/rubygems/dependency.rb:309:in `to_spec'
from /usr/lib/ruby/2.1.0/rubygems/core_ext/kernel_gem.rb:53:in `gem'
from -e:1:in `<main>'
