In the dialog tutorial the function gtk-dialog-set-alternative-button-order is used. This is unexported from the gtk package as of commit 2ebbadd29520d170bd733d798b3e5cb3682e84f8.
You can make the dialog example work by accessing the unexported function symbol as gtk::gtk-dialog-set-alternative-button-order.
In the dialog tutorial the function
gtk-dialog-set-alternative-button-orderis used. This is unexported from thegtkpackage as of commit2ebbadd29520d170bd733d798b3e5cb3682e84f8. You can make the dialog example work by accessing the unexported function symbol asgtk::gtk-dialog-set-alternative-button-order.