diff --git a/src/libmach/netbsd.c b/src/libmach/netbsd.c
new file mode 100644
--- /dev/null
+++ b/src/libmach/netbsd.c
@@ -0,0 +1,45 @@
+// Copyright 2009, 2010 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// This is stubbed out for the moment. REVISIT
+#include <u.h>
+#include <libc.h>
+#include <bio.h>
+#include <mach.h>
+
+int
+ctlproc(int pid, char *msg)
+{
+	sysfatal("ctlproc unimplemented in NetBSD");
+}
+
+char*
+proctextfile(int pid)
+{
+	sysfatal("proctextfile unimplemented in NetBSD");
+}
+
+char*
+procstatus(int pid)
+{
+	sysfatal("procstatus unimplemented in NetBSD");
+}
+
+Map*
+attachproc(int pid, Fhdr *fp)
+{
+	sysfatal("attachproc unimplemented in NetBSD");
+}
+
+void
+detachproc(Map *m)
+{
+	sysfatal("detachproc unimplemented in NetBSD");
+}
+
+int
+procthreadpids(int pid, int *p, int np)
+{
+	sysfatal("procthreadpids unimplemented in NetBSD");
+}