--- libaitsched/src/aitsched.c	2012/05/31 21:36:40	1.9.2.2
+++ libaitsched/src/aitsched.c	2012/05/31 22:31:48	1.10
@@ -3,7 +3,7 @@
 *  by Michael Pounov <misho@openbsd-bg.org>
 *
 * $Author: misho $
-* $Id: aitsched.c,v 1.9.2.2 2012/05/31 21:36:40 misho Exp $
+* $Id: aitsched.c,v 1.10 2012/05/31 22:31:48 misho Exp $
 *
 **************************************************************************
 The ELWIX and AITNET software is distributed under the following
@@ -104,8 +104,10 @@ schedRegisterHooks(sched_root_task_t * __restrict root
 	root->root_hooks.hook_add.alarm = sched_hook_alarm;
 	root->root_hooks.hook_add.node = sched_hook_node;
 	root->root_hooks.hook_add.proc = sched_hook_proc;
-	root->root_hooks.hook_add.user = sched_hook_user;
 	root->root_hooks.hook_add.signal = sched_hook_signal;
+#ifdef EVFILT_USER
+	root->root_hooks.hook_add.user = sched_hook_user;
+#endif
 
 	root->root_hooks.hook_exec.cancel = sched_hook_cancel;
 	root->root_hooks.hook_exec.fetch = sched_hook_fetch;
@@ -309,6 +311,10 @@ schedFetch(sched_root_task_t * __restrict root)
 int
 schedTrigger(sched_task_t * __restrict task)
 {
+#ifndef EVFILT_USER
+	sched_SetErr(ENOTSUP, "Not supported kevent() filter");
+	return -1;
+#else
 	struct kevent chg[1];
 	struct timespec timeout = { 0, 0 };
 
@@ -326,6 +332,7 @@ schedTrigger(sched_task_t * __restrict task)
 	}
 
 	return 0;
+#endif
 }
 
 /*