--- AIO.xs.orig	2019-01-13 10:13:51.000000000 -0800
+++ AIO.xs	2019-03-05 01:41:23.000000000 -0800
@@ -21,6 +21,18 @@
 #include <fcntl.h>
 #include <sched.h>
 
+#ifndef MAP_GROWSDOWN
+#define MAP_GROWSDOWN 0
+#endif
+
+#ifndef MAP_32BIT
+#define MAP_32BIT 0
+#endif
+
+#ifndef MAP_STACK
+#define MAP_STACK 0
+#endif
+
 /* the incompetent fool that created musl keeps __linux__, refuses
  * to implement any linux standard apis, and also has no way to test
  * for his broken iplementation. don't complain to me if this fails