$NetBSD: patch-dc,v 1.6 2013/05/29 11:11:12 wiz Exp $
--- mono/mini/mini-x86.h.orig	2012-12-05 17:44:33.000000000 +0000
+++ mono/mini/mini-x86.h
@@ -48,7 +48,7 @@ struct sigcontext {
 #endif /* __HAIKU__ */
 
 #if defined( __linux__) || defined(__sun) || defined(__APPLE__) || defined(__NetBSD__) || \
-       defined(__FreeBSD__) || defined(__OpenBSD__)
+       defined(__FreeBSD__) || defined(__OpenBSD__) || defined(__DragonFly__)
 #define MONO_ARCH_USE_SIGACTION
 #endif