diff --git a/configure.in b/configure.in
index dd57ab51..54993dfc 100644
--- a/configure.in
+++ b/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
diff --git a/sysdep/bsd/sysio.h b/sysdep/bsd/sysio.h
index f0b5f401..4f91def5 100644
--- a/sysdep/bsd/sysio.h
+++ b/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