From 70e99d6b5725451c1d3fa8554e1195e22f1db44a Mon Sep 17 00:00:00 2001
From: "Yukihiro \"Matz\" Matsumoto" <matz@ruby-lang.org>
Date: Thu, 13 Jul 2017 00:09:31 +0900
Subject: Define `round()` only on WIN32 platform; fix #3741

---
 mrbgems/mruby-time/src/time.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/mrbgems/mruby-time/src/time.c b/mrbgems/mruby-time/src/time.c
index 33755f570..bd72d3bbd 100644
--- a/mrbgems/mruby-time/src/time.c
+++ b/mrbgems/mruby-time/src/time.c
@@ -18,7 +18,7 @@
 
 #define NDIV(x,y) (-(-((x)+1)/(y))-1)
 
-#if _MSC_VER < 1800
+#if defined(_MSC_VER) && _MSC_VER < 1800
 double round(double x) {
   if (x >= 0.0) {
     return (double)((int)(x + 0.5));
-- 
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