Gtk.load_class :MessageDialog module Gtk # Add non-introspected function to Gtk::Lib module Lib attach_function :gtk_message_dialog_new, [:pointer, Gtk::DialogFlags, Gtk::MessageType, Gtk::ButtonsType, :string, :varargs], :pointer end class MessageDialog def self.new parent, flags, type, buttons, message ptr = Gtk::Lib.gtk_message_dialog_new(parent, flags, type, buttons, '%s', :string, message) constructor_wrap ptr end end end