+#include <limits.h>
+#include <mach-o/dyld.h>
+#include "arch.h"
+#include "interr.h" /* for declaration of lose */
+
+#ifdef LISP_FEATURE_SB_THREAD
+#error "Define threading support functions"
+#else
+int arch_os_thread_init(struct thread *thread) {
+ return 1; /* success */
+}
+int arch_os_thread_cleanup(struct thread *thread) {
+ return 1; /* success */
+}
+#endif