/usr/lib/ is in stompserver 0.9.9gem-3.
This file is owned by root:root, with mode 0o755.
..
/usr/lib/ruby/
/usr/lib/ruby/vendor_ruby/
/usr/lib/ruby/vendor_ruby/stomp_server.rb
/usr/lib/ruby/vendor_ruby/stomp_server/
/usr/lib/ruby/vendor_ruby/stomp_server/queue.rb
/usr/lib/ruby/vendor_ruby/stomp_server/queue_manager.rb
/usr/lib/ruby/vendor_ruby/stomp_server/protocols/
/usr/lib/ruby/vendor_ruby/stomp_server/protocols/http.rb
/usr/lib/ruby/vendor_ruby/stomp_server/protocols/stomp.rb
/usr/lib/ruby/vendor_ruby/stomp_server/stomp_user.rb
/usr/lib/ruby/vendor_ruby/stomp_server/topic_manager.rb
/usr/lib/ruby/vendor_ruby/stomp_server/stomp_id.rb
/usr/lib/ruby/vendor_ruby/stomp_server/test_server.rb
/usr/lib/ruby/vendor_ruby/stomp_server/queue/
/usr/lib/ruby/vendor_ruby/stomp_server/queue/dbm_queue.rb
/usr/lib/ruby/vendor_ruby/stomp_server/queue/ar_message.rb
/usr/lib/ruby/vendor_ruby/stomp_server/queue/activerecord_queue.rb
/usr/lib/ruby/vendor_ruby/stomp_server/queue/memory_queue.rb
/usr/lib/ruby/vendor_ruby/stomp_server/queue/file_queue.rb
/usr/lib/ruby/vendor_ruby/stomp_server/stomp_auth.rb
/usr/lib/ruby/vendor_ruby/stomp_server/stomp_frame.rb