--- libmalloc/libmalloc-425.100.7/src/platform.h
+++ libmalloc/libmalloc-409.40.6/src/platform.h
@@ -38,9 +38,9 @@
 
 // <rdar://problem/12596555>
 #if MALLOC_TARGET_IOS
-#define CONFIG_MADVISE_PRESSURE_RELIEF 0
+# define CONFIG_MADVISE_PRESSURE_RELIEF 0
 #else // MALLOC_TARGET_IOS
-#define CONFIG_MADVISE_PRESSURE_RELIEF 1
+# define CONFIG_MADVISE_PRESSURE_RELIEF 1
 #endif // MALLOC_TARGET_IOS
 
 // <rdar://problem/12596555>
@@ -48,9 +48,9 @@
 #define CONFIG_AGGRESSIVE_MADVISE 1
 
 #if MALLOC_TARGET_IOS
-#define DEFAULT_AGGRESSIVE_MADVISE_ENABLED true
+# define DEFAULT_AGGRESSIVE_MADVISE_ENABLED true
 #else // MALLOC_TARGET_IOS
-#define DEFAULT_AGGRESSIVE_MADVISE_ENABLED false
+# define DEFAULT_AGGRESSIVE_MADVISE_ENABLED false
 #endif // MALLOC_TARGET_IOS
 
 // <rdar://problem/10397726>
@@ -78,9 +78,6 @@
 #define NANOV2_DEFAULT_MODE NANO_CONDITIONAL
 #endif
 
-// whether to pre-reserve all available nano regions during initialization
-#define CONFIG_NANO_RESERVE_REGIONS 0
-
 
 // This governs a last-free cache of 1 that bypasses the free-list for each region size
 #define CONFIG_TINY_CACHE 1
@@ -97,14 +94,6 @@
 #else // MALLOC_TARGET_64BIT
 #define CONFIG_MEDIUM_ALLOCATOR 0
 #endif // MALLOC_TARGET_64BIT
-
-
-#if CONFIG_MEDIUM_ALLOCATOR
-#define DEFAULT_MEDIUM_ALLOCATOR_ENABLED 1
-#else // CONFIG_MEDIUM_ALLOCATOR
-#define DEFAULT_MEDIUM_ALLOCATOR_ENABLED 0
-#endif // CONFIG_MEDIUM_ALLOCATOR
-
 
 // The large last-free cache (aka. death row cache)
 #if TARGET_OS_IOS || TARGET_OS_SIMULATOR || TARGET_OS_DRIVERKIT
@@ -182,6 +171,9 @@
 #define CONFIG_PGM_WRAP_CUSTOM_ZONES 0
 #endif
 
-#define MALLOC_ZERO_POLICY_DEFAULT MALLOC_ZERO_ON_FREE
+
+#ifndef MALLOC_ZERO_ON_FREE_ENABLED_DEFAULT
+#define MALLOC_ZERO_ON_FREE_ENABLED_DEFAULT true
+#endif
 
 #endif // __PLATFORM_H