@@ -19,11 +19,13 @@
 #include <stdio.h>
 #include <stdlib.h>
 
 #import "runtime.h"
 #import "runtime-private.h"
-#import "threading.h"
+
+#ifdef OF_THREADS
+# import "threading.h"
 
 struct lock_s {
 	id	      object;
 	int	      count;
 	of_rmutex_t   rmutex;
@@ -36,14 +38,16 @@
 init(void)
 {
 	if (!of_mutex_new(&mutex))
 		OBJC_ERROR("Failed to create mutex!")
 }
+#endif
 
 int
 objc_sync_enter(id object)
 {
+#ifdef OF_THREADS
 	struct lock_s *lock;
 
 	if (!of_mutex_lock(&mutex))
 		OBJC_ERROR("Failed to lock mutex!");
 
@@ -79,17 +83,19 @@
 	if (!of_mutex_unlock(&mutex))
 		OBJC_ERROR("Failed to unlock mutex!");
 
 	if (!of_rmutex_lock(&lock->rmutex))
 		OBJC_ERROR("Failed to lock mutex!");
+#endif
 
 	return 0;
 }
 
 int
 objc_sync_exit(id object)
 {
+#ifdef OF_THREADS
 	struct lock_s *lock, *last = NULL;
 
 	if (!of_mutex_lock(&mutex))
 		OBJC_ERROR("Failed to lock mutex!");
 
@@ -119,6 +125,9 @@
 
 		return 0;
 	}
 
 	OBJC_ERROR("objc_sync_exit() was called for an object not locked!");
+#else
+	return 0;
+#endif
 }