opencv - cvCalcOpticalFlowHS not being recognised C++ -

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i've installed opencv , far has been working, reason if include: cv.h, highgui.h error when want use function:

 cvcalcopticalflowhs: error c2065: 'cvcalcopticalflowhs' : undeclared identifier.

i've tried header file needs included, i've had no succes far.

do

#include "opencv2/legacy/legacy.hpp"

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