/usr/lib/ruby/vendor_ruby/1.8/gdk_pixbuf2.rb is in ruby-gdk-pixbuf2 1.0.3-1build1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/ruby/vendor_ruby/1.8/../gdk_pixbuf2.rb
/usr/lib/ruby/vendor_ruby/1.8/../gdk_pixbuf2.rb