/usr/lib/ruby/ is in ruby-amrita 1.0.2-10build1.
This file is owned by root:root, with mode 0o755.
..
/usr/lib/ruby/vendor_ruby/
/usr/lib/ruby/vendor_ruby/amrita/
/usr/lib/ruby/vendor_ruby/amrita/cgikit.rb
/usr/lib/ruby/vendor_ruby/amrita/ams.rb
/usr/lib/ruby/vendor_ruby/amrita/amx.rb
/usr/lib/ruby/vendor_ruby/amrita/compiler.rb
/usr/lib/ruby/vendor_ruby/amrita/format.rb
/usr/lib/ruby/vendor_ruby/amrita/handlers.rb
/usr/lib/ruby/vendor_ruby/amrita/merge.rb
/usr/lib/ruby/vendor_ruby/amrita/node.rb
/usr/lib/ruby/vendor_ruby/amrita/node_expand.rb
/usr/lib/ruby/vendor_ruby/amrita/parser.rb
/usr/lib/ruby/vendor_ruby/amrita/parts.rb
/usr/lib/ruby/vendor_ruby/amrita/tag.rb
/usr/lib/ruby/vendor_ruby/amrita/template.rb
/usr/lib/ruby/vendor_ruby/amrita/xml.rb