extern int *_NSGetArgc(void);
extern char ***_NSGetEnviron(void);
extern char **_NSGetProgname(void);
-extern struct mach_header *_NSGetMachExecuteHeader(void);
+#ifdef __LP64__
+extern struct mach_header_64 *
+#else /* !__LP64__ */
+extern struct mach_header *
+#endif /* __LP64__ */
+ _NSGetMachExecuteHeader(void);
__END_DECLS