/usr/lib/ is in ruby-gnome2-dev 2.1.0-1.
This file is owned by root:root, with mode 0o755.
..
/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/rbgdk-pixbuf2conversions.h
/usr/lib/x86_64-linux-gnu/ruby/vendor_ruby/2.0.0/rbgdk.h
/usr/lib/x86_64-linux-gnu/ruby/vendor_ruby/2.0.0/rbgdkconversions.h
/usr/lib/x86_64-linux-gnu/ruby/vendor_ruby/2.0.0/rbpangoversion.h
/usr/lib/x86_64-linux-gnu/ruby/vendor_ruby/2.0.0/rb-gobject-introspection.h
/usr/lib/x86_64-linux-gnu/ruby/vendor_ruby/2.0.0/glib-enum-types.h
/usr/lib/x86_64-linux-gnu/ruby/vendor_ruby/2.0.0/rbglib2conversions.h
/usr/lib/x86_64-linux-gnu/ruby/vendor_ruby/2.0.0/rbgtkconversions.h
/usr/lib/x86_64-linux-gnu/ruby/vendor_ruby/2.0.0/rbgtk.h
/usr/lib/x86_64-linux-gnu/ruby/vendor_ruby/2.0.0/rbatk.h
/usr/lib/x86_64-linux-gnu/ruby/vendor_ruby/2.0.0/rbgobject.h
/usr/lib/x86_64-linux-gnu/ruby/vendor_ruby/2.0.0/rbgdk-pixbuf.h
/usr/lib/x86_64-linux-gnu/ruby/vendor_ruby/2.0.0/rbgio2.h
/usr/lib/x86_64-linux-gnu/ruby/vendor_ruby/2.0.0/rbglibdeprecated.h
/usr/lib/x86_64-linux-gnu/ruby/vendor_ruby/2.0.0/rbgtk3conversions.h
/usr/lib/x86_64-linux-gnu/ruby/vendor_ruby/2.0.0/rbpango.h
/usr/lib/x86_64-linux-gnu/ruby/vendor_ruby/2.0.0/rbgdk3.h
/usr/lib/x86_64-linux-gnu/ruby/vendor_ruby/2.0.0/rbgcompat.h
/usr/lib/x86_64-linux-gnu/ruby/vendor_ruby/2.0.0/rbgutil.h
/usr/lib/x86_64-linux-gnu/ruby/vendor_ruby/2.0.0/rbgutildeprecated.h
/usr/lib/x86_64-linux-gnu/ruby/vendor_ruby/2.0.0/rbgio2conversions.h
/usr/lib/x86_64-linux-gnu/ruby/vendor_ruby/2.0.0/rbgutil_list.h
/usr/lib/x86_64-linux-gnu/ruby/vendor_ruby/2.0.0/rbgdk3conversions.h
/usr/lib/x86_64-linux-gnu/ruby/vendor_ruby/2.0.0/rbgtkmacros.h
/usr/lib/x86_64-linux-gnu/ruby/vendor_ruby/2.0.0/rbatkversion.h
/usr/lib/x86_64-linux-gnu/ruby/vendor_ruby/2.0.0/rbpangoconversions.h
/usr/lib/x86_64-linux-gnu/ruby/vendor_ruby/2.0.0/rbgtk3.h
/usr/lib/x86_64-linux-gnu/ruby/vendor_ruby/2.0.0/rbglib.h
/usr/lib/ruby/
/usr/lib/ruby/vendor_ruby/
/usr/lib/ruby/vendor_ruby/mkmf-gnome2.rb
/usr/lib/ruby/vendor_ruby/glib-mkenums.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/rbgdk-pixbuf2conversions.h
/usr/lib/ruby/vendor_ruby/1.9.1/x86_64-linux/rbgdk.h
/usr/lib/ruby/vendor_ruby/1.9.1/x86_64-linux/rbgdkconversions.h
/usr/lib/ruby/vendor_ruby/1.9.1/x86_64-linux/rbpangoversion.h
/usr/lib/ruby/vendor_ruby/1.9.1/x86_64-linux/rb-gobject-introspection.h
/usr/lib/ruby/vendor_ruby/1.9.1/x86_64-linux/glib-enum-types.h
/usr/lib/ruby/vendor_ruby/1.9.1/x86_64-linux/rbglib2conversions.h
/usr/lib/ruby/vendor_ruby/1.9.1/x86_64-linux/rbgtkconversions.h
/usr/lib/ruby/vendor_ruby/1.9.1/x86_64-linux/rbgtk.h
/usr/lib/ruby/vendor_ruby/1.9.1/x86_64-linux/rbatk.h
/usr/lib/ruby/vendor_ruby/1.9.1/x86_64-linux/rbgobject.h
/usr/lib/ruby/vendor_ruby/1.9.1/x86_64-linux/rbgdk-pixbuf.h
/usr/lib/ruby/vendor_ruby/1.9.1/x86_64-linux/rbgio2.h
/usr/lib/ruby/vendor_ruby/1.9.1/x86_64-linux/rbglibdeprecated.h
/usr/lib/ruby/vendor_ruby/1.9.1/x86_64-linux/rbgtk3conversions.h
/usr/lib/ruby/vendor_ruby/1.9.1/x86_64-linux/rbpango.h
/usr/lib/ruby/vendor_ruby/1.9.1/x86_64-linux/rbgdk3.h
/usr/lib/ruby/vendor_ruby/1.9.1/x86_64-linux/rbgcompat.h
/usr/lib/ruby/vendor_ruby/1.9.1/x86_64-linux/rbgutil.h
/usr/lib/ruby/vendor_ruby/1.9.1/x86_64-linux/rbgutildeprecated.h
/usr/lib/ruby/vendor_ruby/1.9.1/x86_64-linux/rbgio2conversions.h
/usr/lib/ruby/vendor_ruby/1.9.1/x86_64-linux/rbgutil_list.h
/usr/lib/ruby/vendor_ruby/1.9.1/x86_64-linux/rbgdk3conversions.h
/usr/lib/ruby/vendor_ruby/1.9.1/x86_64-linux/rbgtkmacros.h
/usr/lib/ruby/vendor_ruby/1.9.1/x86_64-linux/rbatkversion.h
/usr/lib/ruby/vendor_ruby/1.9.1/x86_64-linux/rbpangoconversions.h
/usr/lib/ruby/vendor_ruby/1.9.1/x86_64-linux/rbgtk3.h
/usr/lib/ruby/vendor_ruby/1.9.1/x86_64-linux/rbglib.h
/usr/lib/ruby/vendor_ruby/gnome2-raketask.rb