--- libgo/go/os/signal/internal/pty/pty.go.orig	2020-03-04 19:30:03.000000000 +1100
+++ libgo/go/os/signal/internal/pty/pty.go	2020-09-08 13:10:03.434076000 +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 aix darwin dragonfly freebsd linux,!android netbsd openbsd solaris
+// +build aix bsdsunix darwin dragonfly freebsd linux,!android netbsd openbsd solaris
 
 // Package pty is a simple pseudo-terminal package for Unix systems,
 // implemented by calling C functions via cgo.