/usr/lib/ is in ruby-charlock-holmes 0.6.9.4.dfsg1-1build1.
This file is owned by root:root, with mode 0o755.
..
/usr/lib/ruby/
/usr/lib/ruby/vendor_ruby/
/usr/lib/ruby/vendor_ruby/charlock_holmes.rb
/usr/lib/ruby/vendor_ruby/charlock_holmes/
/usr/lib/ruby/vendor_ruby/charlock_holmes/string.rb
/usr/lib/ruby/vendor_ruby/charlock_holmes/encoding_detector.rb
/usr/lib/ruby/vendor_ruby/charlock_holmes/version.rb
/usr/lib/ruby/vendor_ruby/1.9.1/
/usr/lib/ruby/vendor_ruby/1.9.1/x86_64-linux/
/usr/lib/ruby/vendor_ruby/1.9.1/x86_64-linux/charlock_holmes/
/usr/lib/ruby/vendor_ruby/1.9.1/x86_64-linux/charlock_holmes/charlock_holmes.so
/usr/lib/x86_64-linux-gnu/
/usr/lib/x86_64-linux-gnu/ruby/
/usr/lib/x86_64-linux-gnu/ruby/vendor_ruby/
/usr/lib/x86_64-linux-gnu/ruby/vendor_ruby/2.0.0/
/usr/lib/x86_64-linux-gnu/ruby/vendor_ruby/2.0.0/charlock_holmes/
/usr/lib/x86_64-linux-gnu/ruby/vendor_ruby/2.0.0/charlock_holmes/charlock_holmes.so