$NetBSD: patch-dn,v 1.2 2013/05/29 11:11:12 wiz Exp $

http://gnats.netbsd.org/45201

--- mono/mini/mini-amd64.h.orig	2012-12-05 17:44:32.000000000 +0000
+++ mono/mini/mini-amd64.h
@@ -252,6 +252,10 @@ typedef struct MonoCompileArch {
 
 #define MONO_ARCH_NOMAP32BIT
 
+#elif defined (__DragonFly__)
+
+#define MONO_ARCH_NOMAP32BIT
+
 #elif defined (__NetBSD__)
 
 #define REG_RAX 14