source 'https://rubygems.org'
gemspec

case ENV['sinatra']
  when '1.3'    then gem 'sinatra', '~> 1.3.0'
  when '1.4'    then gem 'sinatra', '~> 1.4.0'
  when 'master' then gem 'sinatra', :github => 'sinatra/sinatra', :branch => 'master'
end