--- libmalloc/libmalloc-317.121.1/src/platform.h
+++ libmalloc/libmalloc-166.251.2/src/platform.h
@@ -44,13 +44,12 @@
 #endif // MALLOC_TARGET_IOS
 
 // <rdar://problem/12596555>
-#define CONFIG_RECIRC_DEPOT 1
-#define CONFIG_AGGRESSIVE_MADVISE 1
-
 #if MALLOC_TARGET_IOS
-# define DEFAULT_AGGRESSIVE_MADVISE_ENABLED true
+# define CONFIG_RECIRC_DEPOT 1
+# define CONFIG_AGGRESSIVE_MADVISE 1
 #else // MALLOC_TARGET_IOS
-# define DEFAULT_AGGRESSIVE_MADVISE_ENABLED false
+# define CONFIG_RECIRC_DEPOT 1
+# define CONFIG_AGGRESSIVE_MADVISE 0
 #endif // MALLOC_TARGET_IOS
 
 // <rdar://problem/10397726>
@@ -80,7 +79,7 @@
 #if MALLOC_TARGET_IOS
 #define CONFIG_MEDIUM_ALLOCATOR 0
 #else // MALLOC_TARGET_IOS
-#define CONFIG_MEDIUM_ALLOCATOR 1
+#define CONFIG_MEDIUM_ALLOCATOR 0
 #endif // MALLOC_TARGET_IOS
 #else // MALLOC_TARGET_64BIT
 #define CONFIG_MEDIUM_ALLOCATOR 0
@@ -91,10 +90,6 @@
 #define CONFIG_LARGE_CACHE 0
 #else
 #define CONFIG_LARGE_CACHE 1
-#endif
-
-#if CONFIG_LARGE_CACHE
-#define DEFAULT_LARGE_CACHE_ENABLED true
 #endif
 
 #if MALLOC_TARGET_IOS
@@ -113,12 +108,6 @@
 #define ENABLE_MEMORY_RESOURCE_EXCEPTION_HANDLING 1
 #endif
 
-#if !TARGET_OS_DRIVERKIT && (!TARGET_OS_OSX || MALLOC_TARGET_64BIT)
-#define CONFIG_FEATUREFLAGS_SIMPLE 1
-#else
-#define CONFIG_FEATUREFLAGS_SIMPLE 0
-#endif
-
 // presence of commpage memsize
 #define CONFIG_HAS_COMMPAGE_MEMSIZE 1