/usr/ is in rubygems-integration 1.5.
This file is owned by root:root, with mode 0o755.
..
/usr/lib/
/usr/lib/ruby/
/usr/lib/ruby/vendor_ruby/
/usr/lib/ruby/vendor_ruby/rubygems/
/usr/lib/ruby/vendor_ruby/rubygems/defaults/
/usr/lib/ruby/vendor_ruby/rubygems/defaults/operating_system.rb
/usr/share/
/usr/share/rubygems-integration/
/usr/share/rubygems-integration/1.9.1/
/usr/share/rubygems-integration/1.9.1/specifications/
/usr/share/rubygems-integration/1.9.1/specifications/rdoc-3.9.4.gemspec
/usr/share/doc/
/usr/share/doc/rubygems-integration/
/usr/share/doc/rubygems-integration/copyright
/usr/share/doc/rubygems-integration/README.markdown
/usr/share/doc/rubygems-integration/changelog.gz
/usr/share/rubygems-integration/2.0.0