both kernel and glibc define it only on x86(_64).
@@ -15,7 +15,6 @@
#define MAP_FILE 0x00
#define MAP_ANON 0x20
#define MAP_ANONYMOUS MAP_ANON
-#define MAP_32BIT 0x40
#define MAP_NORESERVE 0x4000
#define POSIX_MADV_NORMAL 0
#define MAP_NORESERVE 0x40