-extern void dvmrp_print(const u_char *, u_int);
-extern void egp_print(const u_char *, u_int);
-extern u_int enc_if_print(const struct pcap_pkthdr *, const u_char *);
-extern u_int fr_if_print(const struct pcap_pkthdr *, const u_char *);
-extern u_int mfr_if_print(const struct pcap_pkthdr *, const u_char *);
-extern u_int fr_print(register const u_char *, u_int);
-extern u_int mfr_print(register const u_char *, u_int);