--- libmalloc/libmalloc-657.60.21/src/base.h
+++ libmalloc/libmalloc-521.120.7/src/base.h
@@ -98,14 +98,7 @@
 #define MALLOC_COLD __attribute__((cold))
 #define MALLOC_NOESCAPE __attribute__((noescape))
 #define MALLOC_PRESERVE_MOST __attribute__((preserve_most))
-#define MALLOC_FALLTHROUGH __attribute__((fallthrough))
 #define CHECK_MAGAZINE_PTR_LOCKED(szone, mag_ptr, fun) {}
-
-#if __has_feature(bounds_safety)
-#define __malloc_bidi_indexable __bidi_indexable
-#else
-#define __malloc_bidi_indexable
-#endif
 
 #define SCRIBBLE_BYTE 0xaa /* allocated scribble */
 #define SCRABBLE_BYTE 0x55 /* free()'d scribble */
@@ -197,10 +190,6 @@
 // don't populate the mapping for the allocation
 #define MALLOC_NO_POPULATE (1 << 9)
 
-// See malloc_implementation.h
-// MALLOC_MSL_LITE_WRAPPED_ZONE_FLAGS == (1 << 10)
-
-
 /*
  * These commpage routines provide fast access to the logical cpu number
  * of the calling processor assuming no pre-emption occurs.