/usr/ is in ruby-gnome2-dev 3.2.4-1.
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/glib-mkenums.rb
/usr/lib/ruby/vendor_ruby/gnome2-raketask.rb
/usr/lib/ruby/vendor_ruby/mkmf-gnome2.rb
/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/2.5.0/
/usr/lib/x86_64-linux-gnu/ruby/vendor_ruby/2.5.0/glib-enum-types.h
/usr/lib/x86_64-linux-gnu/ruby/vendor_ruby/2.5.0/rb-gobject-introspection.h
/usr/lib/x86_64-linux-gnu/ruby/vendor_ruby/2.5.0/rb-pango-conversions.h
/usr/lib/x86_64-linux-gnu/ruby/vendor_ruby/2.5.0/rb-pango.h
/usr/lib/x86_64-linux-gnu/ruby/vendor_ruby/2.5.0/rbgcompat.h
/usr/lib/x86_64-linux-gnu/ruby/vendor_ruby/2.5.0/rbgdk.h
/usr/lib/x86_64-linux-gnu/ruby/vendor_ruby/2.5.0/rbgdkconversions.h
/usr/lib/x86_64-linux-gnu/ruby/vendor_ruby/2.5.0/rbglib.h
/usr/lib/x86_64-linux-gnu/ruby/vendor_ruby/2.5.0/rbglib2conversions.h
/usr/lib/x86_64-linux-gnu/ruby/vendor_ruby/2.5.0/rbglibdeprecated.h
/usr/lib/x86_64-linux-gnu/ruby/vendor_ruby/2.5.0/rbgobject.h
/usr/lib/x86_64-linux-gnu/ruby/vendor_ruby/2.5.0/rbgtk.h
/usr/lib/x86_64-linux-gnu/ruby/vendor_ruby/2.5.0/rbgtkconversions.h
/usr/lib/x86_64-linux-gnu/ruby/vendor_ruby/2.5.0/rbgtkmacros.h
/usr/lib/x86_64-linux-gnu/ruby/vendor_ruby/2.5.0/rbgutil.h
/usr/lib/x86_64-linux-gnu/ruby/vendor_ruby/2.5.0/rbgutil_list.h
/usr/lib/x86_64-linux-gnu/ruby/vendor_ruby/2.5.0/rbgutildeprecated.h
/usr/share/
/usr/share/doc/
/usr/share/doc/ruby-gnome2-dev/
/usr/share/doc/ruby-gnome2-dev/changelog.Debian.gz
/usr/share/doc/ruby-gnome2-dev/copyright
/usr/share/lintian/
/usr/share/lintian/overrides/
/usr/share/lintian/overrides/ruby-gnome2-dev