/usr/lib/ruby/ is in chake 0.15-1.
This file is owned by root:root, with mode 0o755.
..
/usr/lib/ruby/vendor_ruby/
/usr/lib/ruby/vendor_ruby/chake/
/usr/lib/ruby/vendor_ruby/chake/backend/
/usr/lib/ruby/vendor_ruby/chake/backend/local.rb
/usr/lib/ruby/vendor_ruby/chake/backend/ssh.rb
/usr/lib/ruby/vendor_ruby/chake/backend.rb
/usr/lib/ruby/vendor_ruby/chake/bootstrap/
/usr/lib/ruby/vendor_ruby/chake/bootstrap/00_set_hostname.sh
/usr/lib/ruby/vendor_ruby/chake/bootstrap/01_debian.sh
/usr/lib/ruby/vendor_ruby/chake/bootstrap/99_unsupported.sh
/usr/lib/ruby/vendor_ruby/chake/node.rb
/usr/lib/ruby/vendor_ruby/chake/readline.rb
/usr/lib/ruby/vendor_ruby/chake/tmpdir.rb
/usr/lib/ruby/vendor_ruby/chake/version.rb
/usr/lib/ruby/vendor_ruby/chake.rb