$NetBSD: patch-dk,v 1.4 2014/11/30 08:40:51 spz Exp $

--- libgc/include/gc.h.orig	2014-09-22 13:23:05.000000000 +0000
+++ libgc/include/gc.h
@@ -526,6 +526,7 @@ GC_API GC_PTR GC_malloc_atomic_ignore_of
 /* This may also be desirable if it is possible but expensive to	*/
 /* retrieve the call chain.						*/
 #if (defined(__linux__) || defined(__NetBSD__) || defined(__OpenBSD__) \
+     || defined(__DragonFly__) \
      || defined(__FreeBSD__)) & !defined(GC_CAN_SAVE_CALL_STACKS)
 # define GC_ADD_CALLER
 # if __GNUC__ >= 3 || (__GNUC__ == 2 && __GNUC_MINOR__ >= 95)