#include <stdio.h>
#ifdef _WIN32
-# undef STDERR_FILENO
-# undef STDOUT_FILENO
-# define STDERR_FILENO 2
-# define STDOUT_FILENO 1
-
+# ifndef STDERR_FILENO
+# define STDERR_FILENO 2
+# endif
+# ifndef STDOUT_FILENO
+# define STDOUT_FILENO 1
+# endif
# ifndef __MINGW32__
# define _WIN32_LEAN_AND_MEAN
# include <windows.h>