gtk/print.go
func (po *PrintOperation) SetNPages(pages int) {
	C.gtk_print_operation_set_n_pages(po.native(), C.gint(pages))
}
func (po *PrintOperation) SetNPages(pages int) {
	C.gtk_print_operation_set_n_pages(po.native(), C.gint(pages))
}
// SetNPages() is a wrapper around gtk_print_operation_set_n_pages().