#define IP_MTU 14 /* linux is lame */
#endif
+#ifdef __FreeBSD__
+/* Standard definition causes type-punning problems. */
+#undef IN6_IS_ADDR_V4MAPPED
+#define s6_addr32 __u6_addr.__u6_addr32
+#define IN6_IS_ADDR_V4MAPPED(a) \
+ (((a)->s6_addr32[0] == 0) && \
+ ((a)->s6_addr32[1] == 0) && \
+ ((a)->s6_addr32[2] == htonl(0x0000ffff)))
+#endif
+
#ifdef WATT32
#define sock_write SockWrite /* Watt-32 uses same names */
#define sock_read SockRead