/usr/lib/ruby/ is in ruby-fog-powerdns 0.1.1+debian-1.
This file is owned by root:root, with mode 0o755.
..
/usr/lib/ruby/vendor_ruby/
/usr/lib/ruby/vendor_ruby/fog/
/usr/lib/ruby/vendor_ruby/fog/powerdns.rb
/usr/lib/ruby/vendor_ruby/fog/powerdns/
/usr/lib/ruby/vendor_ruby/fog/powerdns/version.rb
/usr/lib/ruby/vendor_ruby/fog/powerdns/dns.rb
/usr/lib/ruby/vendor_ruby/fog/powerdns/models/
/usr/lib/ruby/vendor_ruby/fog/powerdns/models/dns/
/usr/lib/ruby/vendor_ruby/fog/powerdns/models/dns/zones.rb
/usr/lib/ruby/vendor_ruby/fog/powerdns/models/dns/records.rb
/usr/lib/ruby/vendor_ruby/fog/powerdns/models/dns/zone.rb
/usr/lib/ruby/vendor_ruby/fog/powerdns/models/dns/record.rb
/usr/lib/ruby/vendor_ruby/fog/powerdns/requests/
/usr/lib/ruby/vendor_ruby/fog/powerdns/requests/dns/
/usr/lib/ruby/vendor_ruby/fog/powerdns/requests/dns/list_cryptokeys.rb
/usr/lib/ruby/vendor_ruby/fog/powerdns/requests/dns/get_zone.rb
/usr/lib/ruby/vendor_ruby/fog/powerdns/requests/dns/get_server.rb
/usr/lib/ruby/vendor_ruby/fog/powerdns/requests/dns/update_server_config.rb
/usr/lib/ruby/vendor_ruby/fog/powerdns/requests/dns/notify_zone.rb
/usr/lib/ruby/vendor_ruby/fog/powerdns/requests/dns/get_server_config.rb
/usr/lib/ruby/vendor_ruby/fog/powerdns/requests/dns/get_cryptokey.rb
/usr/lib/ruby/vendor_ruby/fog/powerdns/requests/dns/search_log.rb
/usr/lib/ruby/vendor_ruby/fog/powerdns/requests/dns/create_zone.rb
/usr/lib/ruby/vendor_ruby/fog/powerdns/requests/dns/list_servers.rb
/usr/lib/ruby/vendor_ruby/fog/powerdns/requests/dns/update_rrsets.rb
/usr/lib/ruby/vendor_ruby/fog/powerdns/requests/dns/get_server_stats.rb
/usr/lib/ruby/vendor_ruby/fog/powerdns/requests/dns/list_zones.rb
/usr/lib/ruby/vendor_ruby/fog/powerdns/requests/dns/delete_zone.rb
/usr/lib/ruby/vendor_ruby/fog/powerdns/requests/dns/update_zone.rb
/usr/lib/ruby/vendor_ruby/fog/powerdns/requests/dns/retrieve_zone.rb
/usr/lib/ruby/vendor_ruby/fog/powerdns/requests/dns/list_server_configs.rb