From 4da8543d0db543024abfd4b37036932ace9eeca2 Mon Sep 17 00:00:00 2001
From: Campbell Barton <ideasman42@gmail.com>
Date: Tue, 26 Jul 2016 05:28:13 +1000
Subject: Resolve undefined M_PI w/ MSVC2013

---
 extern/curve_fit_nd/intern/curve_fit_cubic_refit.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/extern/curve_fit_nd/intern/curve_fit_cubic_refit.c b/extern/curve_fit_nd/intern/curve_fit_cubic_refit.c
index 46445467869..c78b79d76ef 100644
--- a/extern/curve_fit_nd/intern/curve_fit_cubic_refit.c
+++ b/extern/curve_fit_nd/intern/curve_fit_cubic_refit.c
@@ -43,6 +43,10 @@
  *   While re-fitting, remove knots that fall below the error threshold.
  */
 
+#ifdef _MSC_VER
+#  define _USE_MATH_DEFINES
+#endif
+
 #include <math.h>
 #include <float.h>
 #include <stdbool.h>
-- 
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