$NetBSD: patch-da,v 1.1 2005/12/30 21:35:58 joerg Exp $

--- xpcom/build/malloc.c.orig	2005-12-29 17:03:39.000000000 +0000
+++ xpcom/build/malloc.c
@@ -918,7 +918,7 @@ struct mallinfo {
 
 
 #ifdef LACKS_UNISTD_H
-#if !defined(__FreeBSD__) && !defined(__OpenBSD__) && !defined(__NetBSD__)
+#if !defined(__FreeBSD__) && !defined(__OpenBSD__) && !defined(__NetBSD__) && !defined(__DragonFly__)
 #if __STD_C
 extern Void_t*     sbrk(ptrdiff_t);
 #else