both kernel and glibc define it only on x86(_64).
#define MAP_FILE 0x00
#define MAP_ANON 0x20
#define MAP_ANONYMOUS MAP_ANON
#define MAP_FILE 0x00
#define MAP_ANON 0x20
#define MAP_ANONYMOUS MAP_ANON
#define MAP_NORESERVE 0x4000
#define POSIX_MADV_NORMAL 0
#define MAP_NORESERVE 0x4000
#define POSIX_MADV_NORMAL 0
#define MAP_FILE 0x00
#define MAP_ANON 0x20
#define MAP_ANONYMOUS MAP_ANON
#define MAP_FILE 0x00
#define MAP_ANON 0x20
#define MAP_ANONYMOUS MAP_ANON
#define MAP_NORESERVE 0x4000
#define POSIX_MADV_NORMAL 0
#define MAP_NORESERVE 0x4000
#define POSIX_MADV_NORMAL 0
#define MAP_FILE 0x00
#define MAP_ANON 0x20
#define MAP_ANONYMOUS MAP_ANON
#define MAP_FILE 0x00
#define MAP_ANON 0x20
#define MAP_ANONYMOUS MAP_ANON
#define MAP_NORESERVE 0x40
#define POSIX_MADV_NORMAL 0
#define MAP_NORESERVE 0x40
#define POSIX_MADV_NORMAL 0