/usr/lib/ruby/ is in ruby-gettext-rails 2.1.0-2.
This file is owned by root:root, with mode 0o755.
..
/usr/lib/ruby/vendor_ruby/
/usr/lib/ruby/vendor_ruby/gettext_rails.rb
/usr/lib/ruby/vendor_ruby/gettext_rails/
/usr/lib/ruby/vendor_ruby/gettext_rails/action_mailer.rb
/usr/lib/ruby/vendor_ruby/gettext_rails/action_view/
/usr/lib/ruby/vendor_ruby/gettext_rails/action_view/date_helper.rb
/usr/lib/ruby/vendor_ruby/gettext_rails/action_view/form_builder.rb
/usr/lib/ruby/vendor_ruby/gettext_rails/action_view/active_record_helper.rb
/usr/lib/ruby/vendor_ruby/gettext_rails/action_controller.rb
/usr/lib/ruby/vendor_ruby/gettext_rails/tools.rb
/usr/lib/ruby/vendor_ruby/gettext_rails/action_view.rb
/usr/lib/ruby/vendor_ruby/gettext_rails/version.rb