$NetBSD: patch-ae,v 1.12 2013/05/29 11:11:12 wiz Exp $
--- libgc/configure.orig	2012-12-05 17:50:43.000000000 +0000
+++ libgc/configure
@@ -4939,7 +4939,7 @@ $as_echo "$as_me: WARNING: \"Only HP/UX 
 
 	THREADDLLIBS="-lpthread -lrt"
 	;;
-      *-*-freebsd*)
+      *-*-freebsd* | *-*-*dragonfly*)
 	$as_echo "#define GC_FREEBSD_THREADS 1" >>confdefs.h
 
 	if test "x$PTHREAD_CFLAGS" != "x"; then
@@ -4980,6 +4980,8 @@ $as_echo "$as_me: WARNING: \"Only HP/UX 
      *-*-netbsd*)
 	$as_echo "#define GC_NETBSD_THREADS 1" >>confdefs.h
 
+	$as_echo "#define _REENTRANT 1" >>confdefs.h
+
 	if test "${enable_parallel_mark}" = yes; then
 	  $as_echo "#define PARALLEL_MARK 1" >>confdefs.h