$OpenBSD: patch-configure_ac,v 1.1 2018/07/09 07:02:20 sthen Exp $

Index: configure.ac
--- configure.ac.orig
+++ configure.ac
@@ -351,6 +351,7 @@ AC_CHECK_HEADERS([netinet/udp.h], [], [],
 
 # For cpu modules
 AC_CHECK_HEADERS([sys/dkstat.h])
+AC_CHECK_HEADERS([sys/sched.h])
 if test "x$ac_system" = "xDarwin"; then
   AC_CHECK_HEADERS(
     [ \
