This would make it easier to go to v3.The obvious deprecated functions that can be replaced now are :-- gtk_exit() - replace with exit()- gtk_signal_connect - replace with g_signal_connect()When you want to move onto GTK+ v3 the migration guide at https://developer.gnome.org/gtk3/stable/migrating.html would be of help.There are a few examples of using a drawing area and Cairo using both GTK v2 and