-typedef int ip_fw_chk_t __P((struct ip **, int, struct ifnet *, u_int16_t *,
- struct mbuf **, struct ip_fw_chain **, struct sockaddr_in **));
-typedef int ip_fw_ctl_t __P((struct sockopt *));
+typedef int ip_fw_chk_t(struct ip **, int, struct ifnet *, u_int16_t *,
+ struct mbuf **, struct ip_fw_chain **, struct sockaddr_in **);
+typedef int ip_fw_ctl_t(struct sockopt *);