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I'm developing a Rails app on a Mac, and I'm new to testing, so I just added these gems to my Gemfile : group :test, :development do gem 'rspec-rails' gem 'rb-fsevent' gem 'growl' end But my production server runs Linux, so even if they aren't grouped in :production , bundler ( v1.0.21 ) still attempts to install them. ...and fails, obviously! extconf.rb:19:in '<main>': Only Darwin (Mac OS X) systems are supported (RuntimeError) Setting RAILS_ENV to production before running bundle install doesn't work . It worked by running bundle install --without development test , but how can these gems be taken into consideration by bundler only based on your OS? Edit: The bundler wiki provides details on how to use platform as a parameter . The same solution is given in bundler issue #663 , so I tried: group :test, :development do gem 'rspec-rails' platforms :darwin do gem 'rb-fsevent' gem 'growl' end end bundle install does not work, but even if we go back to square one and do bundle install --without darwin , the result is 'darwin' is not a valid platform. The available options are: [:ruby, :ruby_18, :ruby_19, :mri, :mri_18, :mri_19, :rbx, :jruby, :mswin, :mingw, :mingw_18, :mingw_19] Any other (elegant) approaches?

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