--- mono/mini/mini-x86.h.orig	2009-03-03 16:01:51 -0800
+++ mono/mini/mini-x86.h	2009-03-03 16:02:17 -0800
@@ -194,7 +194,7 @@
 	#define UCONTEXT_REG_EIP(ctx) ((ctx)->uc_mcontext.gregs [REG_EIP])
 #endif
 
-#if defined(__FreeBSD__) || defined(__NetBSD__) || defined(__OpenBSD__) || defined(__APPLE__)
+#if defined(__FreeBSD__) || defined(__NetBSD__) || defined(__OpenBSD__) || defined(__APPLE__) || defined(__DragonFly__)
 # define SC_EAX sc_eax
 # define SC_EBX sc_ebx
 # define SC_ECX sc_ecx
