DragonFly support add - thanks to john@marino.st

configure.in

@@ -142,6 +142,10 @@ else
 				;;
 		ipv4:freebsd*)	sysdesc=bsd
 				;;
+		ipv6:dragonfly*)	sysdesc=bsd-v6
+				;;
+		ipv4:dragonfly*)	sysdesc=bsd
+				;;
 		ipv6:kfreebsd*) sysdesc=bsd-v6
 				;;
 		ipv4:kfreebsd*) sysdesc=bsd

sysdep/bsd/sysio.h

@@ -6,6 +6,9 @@
  *	Can be freely distributed and used under the terms of the GNU GPL.
  */
 
+#ifdef __DragonFly__
+#define TCP_MD5SIG	TCP_SIGNATURE_ENABLE
+#endif
 #ifdef IPV6
 
 static inline void