--- bing.c
+++ bing.c
@@ -161,6 +161,7 @@
 #include <netinet/in.h>
 #include <netinet/ip.h>
 #include <netinet/ip_icmp.h>
+#include <arpa/inet.h>
 #ifndef linux
 #include <netinet/ip_var.h>
 #endif /* linux */