$NetBSD: patch-configure,v 1.2 2013/07/19 08:16:36 adam Exp $

--- configure.orig	2013-05-02 09:13:30.000000000 +0000
+++ configure
@@ -17064,6 +17064,14 @@ $as_echo "#define ZMQ_FORCE_MUTEXES 1" >
 
         fi
         ;;
+    *dragonfly*)
+        # Define on DragonFly to enable all library features
+        CPPFLAGS="-D__BSD_VISIBLE $CPPFLAGS"
+
+$as_echo "#define ZMQ_HAVE_FREEBSD 1" >>confdefs.h
+$as_echo "#define ZMQ_DRAGONFLY 1" >>confdefs.h
+
+        ;;
     *freebsd*)
         # Define on FreeBSD to enable all library features
         CPPFLAGS="-D__BSD_VISIBLE $CPPFLAGS"
