+#include <io.h>
+
+#define F_OK 0 /* test for existence of file */
+#define X_OK (1<<0) /* test for execute or search permission */
+#define W_OK (1<<1) /* test for write permission */
+#define R_OK (1<<2) /* test for read permission */
+
+/* Windows defines this already. */
+#undef ERROR