/usr/lib/ruby/ is in ruby-hoe 3.16.0-1.
This file is owned by root:root, with mode 0o755.
..
/usr/lib/ruby/vendor_ruby/
/usr/lib/ruby/vendor_ruby/hoe/
/usr/lib/ruby/vendor_ruby/hoe/clean.rb
/usr/lib/ruby/vendor_ruby/hoe/compiler.rb
/usr/lib/ruby/vendor_ruby/hoe/debug.rb
/usr/lib/ruby/vendor_ruby/hoe/deps.rb
/usr/lib/ruby/vendor_ruby/hoe/flay.rb
/usr/lib/ruby/vendor_ruby/hoe/flog.rb
/usr/lib/ruby/vendor_ruby/hoe/gem_prelude_sucks.rb
/usr/lib/ruby/vendor_ruby/hoe/gemcutter.rb
/usr/lib/ruby/vendor_ruby/hoe/inline.rb
/usr/lib/ruby/vendor_ruby/hoe/newb.rb
/usr/lib/ruby/vendor_ruby/hoe/package.rb
/usr/lib/ruby/vendor_ruby/hoe/publish.rb
/usr/lib/ruby/vendor_ruby/hoe/racc.rb
/usr/lib/ruby/vendor_ruby/hoe/rake.rb
/usr/lib/ruby/vendor_ruby/hoe/rcov.rb
/usr/lib/ruby/vendor_ruby/hoe/rdoc.rb
/usr/lib/ruby/vendor_ruby/hoe/signing.rb
/usr/lib/ruby/vendor_ruby/hoe/test.rb
/usr/lib/ruby/vendor_ruby/hoe.rb