+#define POSIX_MADV_NORMAL 0
+#define POSIX_MADV_RANDOM 1
+#define POSIX_MADV_SEQUENTIAL 2
+#define POSIX_MADV_WILLNEED 3
+#define POSIX_MADV_DONTNEED 0
+
+#define MS_ASYNC 1
+#define MS_INVALIDATE 2
+#define MS_SYNC 4
+
+#define MCL_CURRENT 1
+#define MCL_FUTURE 2
+
+#if defined(_GNU_SOURCE) || defined(_BSD_SOURCE)