--- libmalloc/libmalloc-409.81.2/include/malloc/malloc.h
+++ libmalloc/libmalloc-317.100.9/include/malloc/malloc.h
@@ -29,6 +29,7 @@
 #include <sys/cdefs.h>
 #include <Availability.h>
 
+#ifndef RC_HIDE_HARDWARE_FALL_2018_IOS
 #if __has_feature(ptrauth_calls)
 #include <ptrauth.h>
 
@@ -51,6 +52,7 @@
 		FALSE, ptrauth_string_discriminator("malloc_introspect_tbl")) ptr
 
 #endif	// __has_feature(ptrauth_calls)
+#endif	// RC_HIDE_HARDWARE_FALL_2018_IOS
 
 #ifndef MALLOC_ZONE_FN_PTR
 #define MALLOC_ZONE_FN_PTR(fn) fn
@@ -97,10 +99,6 @@
 	 * not yet been allocated. False negatives are not allowed.
 	 */
     boolean_t (* MALLOC_ZONE_FN_PTR(claimed_address))(struct _malloc_zone_t *zone, void *ptr);
-
-    /* For zone 0 implementations: try to free ptr, promising to call find_zone_and_free
-     * if it turns out not to belong to us */
-    void 	(* MALLOC_ZONE_FN_PTR(try_free_default))(struct _malloc_zone_t *zone, void *ptr);
 } malloc_zone_t;
 
 /*********	Creation and destruction	************/
@@ -313,37 +311,6 @@
 extern void malloc_zone_enumerate_discharged_pointers(malloc_zone_t *zone, void *) __OSX_AVAILABLE_STARTING(__MAC_10_7, __IPHONE_4_3);
 #endif /* __BLOCKS__ */
 
-/*********  Zone version summary ************/
-// Version 0, but optional:
-//   malloc_zone_t::batch_malloc
-//   malloc_zone_t::batch_free
-// Version 5:
-//   malloc_zone_t::memalign
-// Version 6:
-//   malloc_zone_t::free_definite_size
-// Version 7:
-//   malloc_introspection_t::enable_discharge_checking
-//   malloc_introspection_t::disable_discharge_checking
-//   malloc_introspection_t::discharge
-// Version 8:
-//   malloc_zone_t::pressure_relief
-// Version 9:
-//   malloc_introspection_t::reinit_lock
-// Version 10:
-//   malloc_zone_t::claimed_address
-// Version 11:
-//   malloc_introspection_t::print_task
-// Version 12:
-//   malloc_introspection_t::task_statistics
-// Version 13:
-//   - malloc_zone_t::malloc and malloc_zone_t::calloc assume responsibility for
-//     setting errno to ENOMEM on failure
-//   - malloc_zone_t::try_free_default
-
-// These functions are optional and calling them requires two checks:
-//  * Check zone version to ensure zone struct is large enough to include the member.
-//  * Check that the function pointer is not null.
-
 __END_DECLS
 
 #endif /* _MALLOC_MALLOC_H_ */