--- include/libnet.h.in.orig	2012-03-06 00:45:46 UTC
+++ include/libnet.h.in
@@ -81,6 +81,9 @@ extern "C" {
 #if !defined(__WIN32__)
 # include <sys/socket.h>
 # include <net/if.h>
+# if defined (__FreeBSD__) || defined (__DragonFly__)
+#  include <netinet/in.h>
+# endif
 #else /* __WIN32__ */
 # if (__CYGWIN__)
 #  include <sys/socket.h>