gemfile <<-RB
  gem 'rack'
  gem 'rake', '~> 10.4'
RB

# No single Rails version works everywhere, so split it up
if RUBY_VERSION >= "1.9.3"
gemfile <<-RB
  gem 'rack'
  gem 'rake', '~> 10.4'
  gem 'rails', '~> 4.2.1'
  gem 'minitest', '5.2.3'
RB
else
gemfile <<-RB
  gem 'rack'
  gem 'rake', '~> 10.4'
  gem 'rails', '~> 3.2.21'
  gem 'i18n', '~>0.6.11'
RB
end

gemfile <<-RB
  gem 'rack'
  gem 'rake', '10.0.0' # Oldest supported version
RB

gemfile <<-RB
  gem 'rack'
  gem 'rake', '0.9.6' # Newest unsupported version
RB

gemfile <<-RB
  gem 'rack'
  gem 'rake', '~> 10.4'
  gem 'newrelic-rake' # Can't coexist with third-party instrumentation
RB