diff -r 6eefdf0fade6 Modules/main.c
--- a/Modules/main.c	Mon Nov 21 11:37:18 2016 +0200
+++ b/Modules/main.c	Tue Nov 22 04:01:13 2016 +0900
@@ -10,6 +10,9 @@
 #endif
 
 #if defined(MS_WINDOWS) || defined(__CYGWIN__)
+#ifdef HAVE_IO_H
+#include <io.h>
+#endif
 #ifdef HAVE_FCNTL_H
 #include <fcntl.h>
 #endif