--- icmpinfo-1.11/linux_ip_icmp.h.rik	Wed May 11 08:08:29 1994
+++ icmpinfo-1.11/linux_ip_icmp.h	Fri Mar 14 09:12:47 1997
@@ -22,6 +22,7 @@
 #define	icmp_seq	icmp_hun.ih_idseq.icd_seq
 #define	icmp_void	icmp_hun.ih_void
 
+#if 0
 struct ip {
         u_char  ip_hl:4,                /* header length */
         ip_v:4;                 /* version */
@@ -36,6 +37,7 @@
         u_short ip_sum;                 /* checksum */
         struct  in_addr ip_src,ip_dst;  /* source and dest address */
       };
+#endif
 
 
 	union {