--- libgo/go/syscall/route_bsdsunix_64bit.go.orig	2020-03-04 19:30:03.000000000 +1100
+++ libgo/go/syscall/route_bsdsunix_64bit.go	2020-09-22 00:20:20.842055000 +1000
@@ -0,0 +1,19 @@
+// Copyright 2014 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.
+
+// +build bsdsunix,amd64
+
+package syscall
+
+import "unsafe"
+
+func (any *anyMessage) parseRouteMessage(b []byte) *RouteMessage {
+	p := (*RouteMessage)(unsafe.Pointer(any))
+	return &RouteMessage{Header: p.Header, Data: b[rsaAlignOf(int(unsafe.Offsetof(p.Header.Rmx))+SizeofRtMetrics):any.Msglen]}
+}
+
+func (any *anyMessage) parseInterfaceMessage(b []byte) *InterfaceMessage {
+	p := (*InterfaceMessage)(unsafe.Pointer(any))
+	return &InterfaceMessage{Header: p.Header, Data: b[int(unsafe.Offsetof(p.Header.Data))+int(p.Header.Data.Datalen) : any.Msglen]}
+}