--- libgo/go/os/sys_bsd.go.orig	2020-03-04 19:30:03.000000000 +1100
+++ libgo/go/os/sys_bsd.go	2020-09-08 12:59:15.712366000 +1000
@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// +build darwin dragonfly freebsd nacl netbsd openbsd
+// +build bsdsunix darwin dragonfly freebsd nacl netbsd openbsd
 
 // os code shared between *BSD systems including OS X (Darwin)
 // and FreeBSD.