From c145f28c710e58f556daf646cb71e60e83a9603f Mon Sep 17 00:00:00 2001
From: Tomoaki Teshima <tomoaki.teshima@gmail.com>
Date: Wed, 12 Apr 2017 20:09:00 +0900
Subject: [PATCH] fix build error on VS2012

---
 modules/calib3d/src/ap3p.cpp | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/modules/calib3d/src/ap3p.cpp b/modules/calib3d/src/ap3p.cpp
index ad2841fe98..db88a02d04 100644
--- a/modules/calib3d/src/ap3p.cpp
+++ b/modules/calib3d/src/ap3p.cpp
@@ -2,6 +2,9 @@
 
 #include <cmath>
 #include <complex>
+#if defined (_MSC_VER) && (_MSC_VER <= 1700)
+static inline double cbrt(double x) { return (double)cv::cubeRoot((float)x); };
+#endif
 
 using namespace std;