-#ifdef KERNEL
-#ifdef __APPLE_API_PRIVATE
-extern int esp6_output __P((struct mbuf *, u_char *, struct mbuf *,
- struct ipsecrequest *));
-extern int esp6_input __P((struct mbuf **, int *));
+#ifdef KERNEL_PRIVATE
+extern int esp6_output(struct mbuf *, u_char *, struct mbuf *,
+ struct ipsecrequest *);
+extern int esp6_input(struct mbuf **, int *);