libopencv_nonfree.so: undefined reference to `cv::ocl::integral
/usr/lib/libopencv_nonfree.so: undefined reference to `cv::ocl::integral(cv::ocl::oclMat const&, cv::ocl::oclMat&)'
collect2: error: ld returned 1 exit status
collect2: error: ld returned 1 exit status
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ncnynl
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