START_EXTERN_C
-#if defined(PERLDLL) && (!defined(__BORLANDC__) || defined(_DLL))
+#if defined(PERLDLL) && defined(USE_DECLSPEC_THREAD) && (!defined(__BORLANDC__) || defined(_DLL))
extern __declspec(thread) struct perl_thread *Perl_current_thread;
#define SET_THR(t) (Perl_current_thread = t)
#define THR Perl_current_thread
#define THR Perl_getTHR()
#define SET_THR(t) Perl_setTHR(t)
#endif
+struct perl_thread;
void Perl_alloc_thread_key _((void));
int Perl_thread_create _((struct perl_thread *thr, thread_func_t *fn));
END_EXTERN_C
#define INIT_THREADS NOOP
-#define ALLOC_THREAD_KEY NOOP
+#define ALLOC_THREAD_KEY Perl_alloc_thread_key()
#define SET_THREAD_SELF(thr) Perl_set_thread_self(thr)
#define JOIN(t, avp) \