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The following works for me.

#include "opencv2/calib3d/calib3d.hpp"
void foo()
{
  cv::StereoSGBM sgbm;
  sgbm( cv::Mat(), cv::Mat(), cv::Mat() );
}

The error you got is a little surprising. Without calib3d.hpp, StereoSGBM should be an undefined symbol. Maybe you have a forward declaration getting in the way.