if defined?(RUBY_ENGINE) && RUBY_ENGINE == "rbx"
  # Excon 0.10.0 doesn't seem to work on Rubinius 2.2.10
  excon_versions = %w(0.25.0 0.24.0 0.19.0 0.18.0)
else
  excon_versions = %w(0.25.0 0.24.0 0.19.0 0.18.0 0.10.0)
end

excon_versions.each do |excon_version|
  gemfile <<-RB
    gem 'excon', '~> #{excon_version}'
    gem 'rack'
    gem 'json', :platforms => [:rbx, :mri_18]
  RB
end