/usr/ is in ruby-builder 3.2.2-1.
This file is owned by root:root, with mode 0o755.
..
/usr/lib/
/usr/lib/ruby/
/usr/lib/ruby/vendor_ruby/
/usr/lib/ruby/vendor_ruby/builder/
/usr/lib/ruby/vendor_ruby/builder/xmlbase.rb
/usr/lib/ruby/vendor_ruby/builder/xmlmarkup.rb
/usr/lib/ruby/vendor_ruby/builder/xmlevents.rb
/usr/lib/ruby/vendor_ruby/builder/version.rb
/usr/lib/ruby/vendor_ruby/builder/blankslate.rb
/usr/lib/ruby/vendor_ruby/builder/xchar.rb
/usr/lib/ruby/vendor_ruby/builder.rb
/usr/share/
/usr/share/rubygems-integration/
/usr/share/rubygems-integration/1.9.1/
/usr/share/rubygems-integration/1.9.1/specifications/
/usr/share/rubygems-integration/1.9.1/specifications/builder-3.2.2.gemspec
/usr/share/rubygems-integration/2.0/
/usr/share/rubygems-integration/2.0/specifications/
/usr/share/rubygems-integration/2.0/specifications/builder-3.2.2.gemspec
/usr/share/doc/
/usr/share/doc/ruby-builder/
/usr/share/doc/ruby-builder/copyright
/usr/share/doc/ruby-builder/changelog.Debian.gz