--- ./libgo/go/net/sockopt_aix.ORIGIN.go	2019-04-04 10:53:16 -0500
+++ ./libgo/go/net/sockopt_aix.go	2019-04-04 10:53:31 -0500
@@ -30,5 +30,13 @@
 func setDefaultMulticastSockopts(s int) error {
 	// Allow multicast UDP and raw IP datagram sockets to listen
 	// concurrently across multiple listeners.
-	return os.NewSyscallError("setsockopt", syscall.SetsockoptInt(s, syscall.SOL_SOCKET, syscall.SO_REUSEADDR, 1))
+	if err := syscall.SetsockoptInt(s, syscall.SOL_SOCKET, syscall.SO_REUSEADDR, 1); err != nil {
+		return os.NewSyscallError("setsockopt", err)
+	}
+
+	// Allow reuse of recently-used ports.
+	// This option is supported only in descendants of 4.4BSD,
+	// to make an effective multicast application that requires
+	// quick draw possible.
+	return os.NewSyscallError("setsockopt", syscall.SetsockoptInt(s, syscall.SOL_SOCKET, syscall.SO_REUSEPORT, 1))
 }