p4raw-id: //depot/perl@233
U32 tid;
struct thread *next, *prev; /* Circular linked list of threads */
JMPENV Tstart_env; /* Top of top_env longjmp() chain */
-#ifdef ADD_THREAD_INTERN
+#ifdef HAVE_THREAD_INTERN
struct thread_intern i; /* Platform-dependent internals */
#endif
char trailing_nul; /* For the sake of thrsv and oursv */