-extern u_int pflog_if_print(const struct pcap_pkthdr *, const u_char *);
-extern u_int arcnet_if_print(const struct pcap_pkthdr *, const u_char *);
-extern u_int arcnet_linux_if_print(const struct pcap_pkthdr *, const u_char *);
-extern u_int token_print(const u_char *, u_int, u_int);
-extern u_int token_if_print(const struct pcap_pkthdr *, const u_char *);
-extern void fddi_print(const u_char *, u_int, u_int);
-extern u_int fddi_if_print(const struct pcap_pkthdr *, const u_char *);