From eda6c1dc0550249b6e2d92c60aaa683d2b154eaf Mon Sep 17 00:00:00 2001
From: Yasuhiro Matsumoto <mattn.jp@gmail.com>
Date: Thu, 8 Dec 2016 15:38:19 +0900
Subject: fix build on vs2013-vs2015

---
 src/numeric.c | 4 ++++
 1 file changed, 4 insertions(+)

(limited to 'src/numeric.c')

diff --git a/src/numeric.c b/src/numeric.c
index 25a411de8..a9a2a641b 100644
--- a/src/numeric.c
+++ b/src/numeric.c
@@ -357,7 +357,11 @@ flo_shift(mrb_state *mrb, mrb_value x, mrb_int width)
     while (width++) {
       val /= 2;
     }
+#if defined(_ISOC99_SOURCE)
     val = trunc(val);
+#else
+    val = val > 0 ? floor(val) : ceil(val);
+#endif
     if (val == 0 && mrb_float(x) < 0) {
       return mrb_fixnum_value(-1);
     }
-- 
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