/usr/ is in ruby-rqrcode 0.3.3-2.
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..
/usr/lib/
/usr/lib/ruby/
/usr/lib/ruby/vendor_ruby/
/usr/lib/ruby/vendor_ruby/rqrcode/
/usr/lib/ruby/vendor_ruby/rqrcode/core_ext/
/usr/lib/ruby/vendor_ruby/rqrcode/core_ext/array/
/usr/lib/ruby/vendor_ruby/rqrcode/core_ext/array/behavior.rb
/usr/lib/ruby/vendor_ruby/rqrcode/core_ext/array.rb
/usr/lib/ruby/vendor_ruby/rqrcode/core_ext/integer.rb
/usr/lib/ruby/vendor_ruby/rqrcode/core_ext/integer/
/usr/lib/ruby/vendor_ruby/rqrcode/core_ext/integer/bitwise.rb
/usr/lib/ruby/vendor_ruby/rqrcode/qrcode/
/usr/lib/ruby/vendor_ruby/rqrcode/qrcode/qr_util.rb
/usr/lib/ruby/vendor_ruby/rqrcode/qrcode/qr_polynomial.rb
/usr/lib/ruby/vendor_ruby/rqrcode/qrcode/qr_8bit_byte.rb
/usr/lib/ruby/vendor_ruby/rqrcode/qrcode/qr_rs_block.rb
/usr/lib/ruby/vendor_ruby/rqrcode/qrcode/qr_code.rb
/usr/lib/ruby/vendor_ruby/rqrcode/qrcode/qr_math.rb
/usr/lib/ruby/vendor_ruby/rqrcode/qrcode/qr_bit_buffer.rb
/usr/lib/ruby/vendor_ruby/rqrcode/qrcode.rb
/usr/lib/ruby/vendor_ruby/rqrcode/core_ext.rb
/usr/lib/ruby/vendor_ruby/rqrcode.rb
/usr/share/
/usr/share/doc/
/usr/share/doc/ruby-rqrcode/
/usr/share/doc/ruby-rqrcode/README
/usr/share/doc/ruby-rqrcode/copyright
/usr/share/doc/ruby-rqrcode/changelog.Debian.gz