/usr/lib/ruby/ is in ruby-factory-girl-rails 4.4.1-2.
This file is owned by root:root, with mode 0o755.
..
/usr/lib/ruby/vendor_ruby/
/usr/lib/ruby/vendor_ruby/generators/
/usr/lib/ruby/vendor_ruby/generators/factory_girl/
/usr/lib/ruby/vendor_ruby/generators/factory_girl/model/
/usr/lib/ruby/vendor_ruby/generators/factory_girl/model/model_generator.rb
/usr/lib/ruby/vendor_ruby/generators/factory_girl/model/templates/
/usr/lib/ruby/vendor_ruby/generators/factory_girl/model/templates/fixtures.erb
/usr/lib/ruby/vendor_ruby/generators/factory_girl.rb
/usr/lib/ruby/vendor_ruby/factory_girl_rails/
/usr/lib/ruby/vendor_ruby/factory_girl_rails/generators/
/usr/lib/ruby/vendor_ruby/factory_girl_rails/generators/null_generator.rb
/usr/lib/ruby/vendor_ruby/factory_girl_rails/generators/non_rspec_generator.rb
/usr/lib/ruby/vendor_ruby/factory_girl_rails/generators/rspec_generator.rb
/usr/lib/ruby/vendor_ruby/factory_girl_rails/railtie.rb
/usr/lib/ruby/vendor_ruby/factory_girl_rails/generator.rb
/usr/lib/ruby/vendor_ruby/factory_girl_rails.rb