Merge pull request opencv#8557 from grundman:patch-3

vpisarev · vpisarev · commit b92bbffa1acf · 2017-05-03T12:12:59.000Z
diff --git a/modules/core/include/opencv2/core/utility.hpp b/modules/core/include/opencv2/core/utility.hpp
@@ -54,6 +54,7 @@
 #endif
 
 #include "opencv2/core.hpp"
+#include <ostream>
 
 namespace cv
 {
