gemは問題無くできるものの、CIがエラー。 $ bundle exec rake /home/vagrant/.rvm/gems/ruby-1.9.2-p290/gems/bundler-1.0.21/lib/bundler/rubygems_integration.rb:143:in `block in replace_gem': rake is not part of the bundle. Add it to Gemfile. (Gem::LoadError) from /home/vagrant/.rvm/gems/ruby-1.9.2-p290/bin/rake:18:in `' Done. Build script exited with: 1 よく見ればちゃんと書いてある。 # gemspec: s.add_development_dependency 'rake', '~