Index: framework/src/objc/RBRuntime.m
===================================================================
--- framework/src/objc/RBRuntime.m	(revision 2293)
+++ framework/src/objc/RBRuntime.m	(working copy)
@@ -507,10 +507,12 @@
    will still load without thread switching hooks support in the ruby 
    interpreter.
 */
+#if 0
 extern void *rb_add_threadswitch_hook(rb_threadswitch_hook_func_t func) 
   __attribute__ ((weak_import));
 extern void rb_remove_threadswitch_hook(void *handle) 
   __attribute__ ((weak_import));
+#endif
 
 /* Cached values for direct call to +[NSThread currentThread] (not clear if 
    this is a significant performance improvement) */
@@ -909,6 +911,7 @@
 
 static void RBCocoaInstallRubyThreadSchedulerHooks()
 {
+#if 0
   SInt32 version;
   if (Gestalt(gestaltSystemVersion, &version) == noErr) {
     if (version >= 0x1060) {
@@ -990,6 +993,7 @@
 
   DLOG("Thread hooks done, main Ruby thread is %p\n", 
     (void *)rb_thread_current());
+#endif
 }
 
 @interface RBRuntime : NSObject