$NetBSD: patch-be,v 1.3 2013/06/05 17:03:55 jperkin Exp $

--- support/sys-mman.c.orig	2013-04-25 09:01:57.000000000 +0000
+++ support/sys-mman.c
@@ -7,7 +7,6 @@
  * Copyright (C) 2004-2006 Jonathan Pryor
  */
 
-#define _XOPEN_SOURCE 600
 
 #ifdef PLATFORM_MACOSX
 /* For mincore () */
@@ -21,6 +20,9 @@
 #include <sys/types.h>
 #include <sys/mman.h>
 #include <errno.h>
+#ifdef __sun
+#include <unistd.h>
+#endif
 
 #include "map.h"
 #include "mph.h"
@@ -105,8 +107,13 @@ Mono_Posix_Syscall_mremap (void *old_add
 	if (Mono_Posix_FromMremapFlags (flags, &_flags) == -1)
 		return MAP_FAILED;
 
+#if defined(__NetBSD__)
+	return mremap (old_address, (size_t) old_size, old_address, (size_t) new_size,
+			(unsigned long) _flags);
+#else
 	return mremap (old_address, (size_t) old_size, (size_t) new_size,
 			(unsigned long) _flags);
+#endif
 }
 #endif /* def HAVE_MREMAP */