+extern boolean interrupt_maybe_gc_int(int, siginfo_t *, void *);
+extern boolean maybe_defer_handler(void *handler, struct interrupt_data *data,
+ int signal, siginfo_t *info,
+ os_context_t *context);
+#if defined LISP_FEATURE_GENCGC
+/* assembly language stub that executes trap_PendingInterrupt */
+extern void do_pending_interrupt(void);
+#endif
+