undefined reference to BlobAnalysis in class CBlobresult

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I am working on traffic surveillance system and now I want to detect no. of cars and classify them according to their size.I used average method to get cars as blobs and now I am trying to draw rectangles around cars by getting coordinates of the blobs I'm getting in thresholded image.But I am getting an error while using CblobResult,saying "undefined reference to `BlobAnalysis(_IplImage*, unsigned char, _IplImage*, bool, bool, std::vector >&)" How can I remove this error?

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