My first rails app: my ruby -v: ruby 1.9.2p320 (2012-04-20 revision 35421) [x86_64-darwin10.8.0] rails version: rails 3.2.5
On a machine with ruby >= 1.9.2 at command prompt
gem install rails
git clone [email protected]:dbwest/infinitestore.git
cd infinitestore
bundle install
rake db:migrate
rails s
then visit localhost:3000 in your browser, and you should have a working ecommerce site