--- networking/ping.c.orig	2018-12-30 15:14:20 UTC
+++ networking/ping.c
@@ -119,7 +119,12 @@
 //usage:       "round-trip min/avg/max = 20.1/20.1/20.1 ms\n"
 
 #include <net/if.h>
+
+#include <netinet/in.h>
+#include <netinet/in_systm.h>
+#include <netinet/ip.h>
 #include <netinet/ip_icmp.h>
+
 #include "libbb.h"
 #include "common_bufsiz.h"
 
@@ -147,6 +152,42 @@
 # define SOL_RAW IPPROTO_RAW
 #endif
 
+#if defined(__FreeBSD__) || defined(__APPLE__)
+/**
+ * On BSD the IPv4 struct is called struct ip and instead of iXX
+ * the members are called ip_XX. One could change this code to use
+ * struct ip but that would require to define _BSD_SOURCE and that
+ * might have other complications. Instead make sure struct iphdr
+ * is present on FreeBSD. The below is taken from GLIBC.
+ *
+ * The GNU C Library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ */
+struct iphdr
+  {
+#if BYTE_ORDER == LITTLE_ENDIAN
+    unsigned int ihl:4;
+    unsigned int version:4;
+#elif BYTE_ORDER == BIG_ENDIAN
+    unsigned int version:4;
+    unsigned int ihl:4;
+#endif
+    u_int8_t tos;
+    u_int16_t tot_len;
+    u_int16_t id;
+    u_int16_t frag_off;
+    u_int8_t ttl;
+    u_int8_t protocol;
+    u_int16_t check;
+    u_int32_t saddr;
+    u_int32_t daddr;
+    /*The options start here. */
+  };
+#endif
+
+
 #if ENABLE_PING6
 # include <netinet/icmp6.h>
 /* I see RENUMBERED constants in bits/in.h - !!?