First, obviously, you’ll need FriendlyORM:
gem install friendly
You’ll also want memcached for the caching portion:
gem install memcached
Oh, and yeah, you’ll probably want rails. I did the demo with 2.3.4; you can either install that version or change the version requirement in config/environments.rb
gem install rails -v2.3.4
rake db:create:all rake db:migrate rake spec # make sure everything passes