Merge pull request opencv#8665 from louiehelm:master

alalek · alalek · commit a740a4ca3816 · 2017-04-28T05:10:50.000Z
diff --git 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"
