--- Libc/Libc-997.1.1/include/sys/cdefs.h
+++ Libc/Libc-825.24/include/sys/cdefs.h
@@ -103,15 +103,10 @@
 #define LIBC_EXTSN(sym)		__asm("_" __STRING(sym) LIBC_SUF_EXTSN)
 #define LIBC_EXTSN_C(sym)	__asm("_" __STRING(sym) LIBC_SUF_EXTSN LIBC_SUF_NON_CANCELABLE)
 
+extern int __pthread_tsd_first;
 extern int pthread_key_init_np(int, void (*)(void *));
 
-#include <TargetConditionals.h>
-#if TARGET_IPHONE_SIMULATOR
-/* Simulator keys are offset by 200 */
-#define	__LIBC_PTHREAD_KEY(x)		(210 + (x))
-#else
-#define	__LIBC_PTHREAD_KEY(x)		(10 + (x))
-#endif
+#define	__LIBC_PTHREAD_KEY(x)		(__pthread_tsd_first + (x))
 
 /*
  * Libc pthread key assignments