From 39874d72546ddecef1e51c708f0d025656fb670b Mon Sep 17 00:00:00 2001
From: Louie Helm <lhelm@umich.edu>
Date: Thu, 27 Apr 2017 16:28:36 -0700
Subject: [PATCH] Fix Farneback GPU Sample in GCC6

---
 samples/gpu/farneback_optical_flow.cpp | 1 +
 1 file changed, 1 insertion(+)

diff --git a/samples/gpu/farneback_optical_flow.cpp b/samples/gpu/farneback_optical_flow.cpp
index 798b108a62..b3d67b6738 100644
--- a/samples/gpu/farneback_optical_flow.cpp
+++ b/samples/gpu/farneback_optical_flow.cpp
@@ -1,6 +1,7 @@
 #include <iostream>
 #include <vector>
 #include <sstream>
+#include <cmath>
 
 #include "opencv2/core.hpp"
 #include "opencv2/core/utility.hpp"