Snap for 4551672 from 750bd0eb27a5ac5bf5d8528e76491b395f68ab28 to pi-release

Change-Id: Id2ec8a1c5070fd1d335a82e7d5d79275befd5e08
diff --git a/gen_constants-inl.h b/gen_constants-inl.h
index e439b3e..ea8c701 100644
--- a/gen_constants-inl.h
+++ b/gen_constants-inl.h
@@ -9,6 +9,7 @@
 #include <linux/termios.h>
 #include <stddef.h>
 #include <signal.h>
+#include <sys/mman.h>
 #include <sys/stat.h>
 #include <sys/resource.h>
 #include <sys/types.h>