fail gems.rb

config.gem "rspec", :lib => false
config.gem "rspec-rails", :lib => false
config.gem "cucumber", :lib => false
config.gem "thoughtbot-factory_girl", :lib => false, :source => "http://gems.github.com"
config.gem "faker", :lib => false
config.gem "carlosbrando-remarkable", :lib => "remarkable", :source => "http://gems.github.com"
config.gem "haml"
config.gem "webrat"
config.gem "htmlentities"
config.gem "json"

lots better.rb

config.with_options :lib => false do |t|
  t.gem "rspec"
  t.gem "rspec-rails"
  t.gem "cucumber"
  t.gem "faker"

  t.with_options :source => "http://gems.github.com" do |gh|
    gh.gem "thoughtbot-factory_girl"
    gh.gem "carlosbrando-remarkable"
  end
end

config.gem "haml"
config.gem "webrat"
config.gem "htmlentities"
config.gem "json"

simpler redundancy.rb

config.gem "rspec",                   :lib => false
config.gem "rspec-rails",             :lib => false
config.gem "cucumber",                :lib => false
config.gem "thoughtbot-factory_girl", :lib => false,        :source => "http://gems.github.com"
config.gem "faker",                   :lib => false
config.gem "carlosbrando-remarkable", :lib => "remarkable", :source => "http://gems.github.com"
config.gem "haml"
config.gem "webrat"
config.gem "htmlentities"
config.gem "json"