Index: head/lib/libthr/thread/thr_init.c
===================================================================
--- head/lib/libthr/thread/thr_init.c
+++ head/lib/libthr/thread/thr_init.c
@@ -474,8 +474,9 @@
 				PANIC("Cannot get stack rlimit");
 			_thr_stack_initial = rlim.rlim_cur;
 		}
-		len = sizeof(_thr_is_smp);
-		sysctlbyname("kern.smp.cpus", &_thr_is_smp, &len, NULL, 0);
+		_thr_is_smp = sysconf(_SC_NPROCESSORS_CONF);
+		if (_thr_is_smp == -1)
+			PANIC("Cannot get _SC_NPROCESSORS_CONF");
 		_thr_is_smp = (_thr_is_smp > 1);
 		_thr_page_size = getpagesize();
 		_thr_guard_default = _thr_page_size;