$NetBSD: patch-ae,v 1.13 2014/11/30 08:40:51 spz Exp $
--- libgc/configure.orig	2014-10-04 09:29:04.000000000 +0000
+++ libgc/configure
@@ -5037,7 +5037,7 @@ $as_echo "$as_me: WARNING: \"Only HP/UX 
 	$as_echo "#define USE_COMPILER_TLS 1" >>confdefs.h
 
 	;;
-      *-*-freebsd*)
+      *-*-freebsd* | *-*-*dragonfly*)
 	$as_echo "#define GC_FREEBSD_THREADS 1" >>confdefs.h
 
 	if test "x$PTHREAD_CFLAGS" != "x"; then
@@ -5078,6 +5078,8 @@ $as_echo "$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