From b4dcb8f2863274314d202baafc7f1f64b5a4cc7f Mon Sep 17 00:00:00 2001
From: "Yukihiro \"Matz\" Matsumoto" <matz@ruby.or.jp>
Date: Mon, 18 Dec 2017 11:10:49 +0900
Subject: Use `_dup` instead of `dup` on Windows; ref #3903

---
 mrbgems/mruby-io/src/io.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/mrbgems/mruby-io/src/io.c b/mrbgems/mruby-io/src/io.c
index 643671d1e..0abb9014a 100644
--- a/mrbgems/mruby-io/src/io.c
+++ b/mrbgems/mruby-io/src/io.c
@@ -25,6 +25,7 @@
   #include <io.h>
   #define open  _open
   #define close _close
+  #define dup _dup
   #define read  _read
   #define write _write
   #define lseek _lseek
-- 
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