$NetBSD: patch-bs,v 1.1 2021/07/04 07:57:13 jnemeth Exp $

--- libsm/notify.c.orig	2020-05-19 19:54:32.000000000 +0000
+++ libsm/notify.c
@@ -15,6 +15,7 @@
 #include <sm/assert.h>
 #include <sm/notify.h>
 
+#include <sys/select.h>
 #include <sys/types.h>
 #include <signal.h>
 #include <stdio.h>