Before continuing you should ensure you have a working Ruby environment up and running. We recommend the following:
Ruby 1.9.2 or 1.8.7 http://ruby-lang.org
Ruby Version Manager RVM https://rvm.beginrescueend.com/
Rubygems 1.8.6 https://rubygems.org
Bundler 1.0 http://gembundler.com/
gem install couchbase-ruby-client