cmake -B build -S $pkgname \ -DWITH_VTK=OFF \ -DWITH_OPENCL=OFF \ -DWITH_OPENGL=ON \ -DWITH_TBB=ON \ -DBUILD_WITH_DEBUG_INFO=OFF \ -DBUILD_TESTS=OFF \ -DBUILD_PERF_TESTS=OFF \ -DBUILD_EXAMPLES=OFF \ -DINSTALL_C_EXAMPLES=OFF \ -DINSTALL_PYTHON_EXAMPLES=OFF \ -DCMAKE_INSTALL_PREFIX=/usr \ -DOPENCV_EXTRA_MODULES_PATH="$srcdir/opencv_contrib/modules" \ -DOPENCV_SKIP_PYTHON_LOADER=ON \ -DOPENCV_PYTHON3_INSTALL_PATH=$_pythonpath \ -DLAPACK_LIBRARIES="/usr/lib/liblapack.so;/usr/lib/libblas.so;/usr/lib/libcblas.so" \ -DLAPACK_CBLAS_H="/usr/include/cblas.h" \ -DLAPACK_LAPACKE_H="/usr/include/lapacke.h" \ -DOPENCV_GENERATE_PKGCONFIG=ON \ -DOPENCV_ENABLE_NONFREE=ON \ -DOPENCV_GENERATE_SETUPVARS=OFF \ -DWITH_1394=OFF \ -DEIGEN_INCLUDE_PATH=/usr/include/eigen3 \ -DCPU_BASELINE_DISABLE=SSE3,AVX512_SKX \ -DCPU_DISPATCH= \ -DBUILD_opencv_java=OFF \ -DBUILD_opencv_cvv=OFF \ -DBUILD_opencv_dnn=ON \ -DBUILD_highgui=OFF \ -DWITH_FFMPEG=ON \ -DWITH_QT=OFF \ -DWITH_PROTOBUF=OFF \ -DWITH_IPP=OFF \ -DWITH_ZLIB_NG=ON LC_ALL=C cmake --build build 

In file included from ./opencv_contrib/modules/bgsegm/src/precomp.hpp:45, from ./opencv_contrib/modules/bgsegm/src/bgfg_gaussmix.cpp:43: ./opencv_contrib/modules/bgsegm/include/opencv2/bgsegm.hpp:89:26: error: 'virtual void cv::bgsegm::BackgroundSubtractorMOG::apply(cv::InputArray, cv::InputArray, cv::OutputArray, double)' marked 'override', but does not override 89 | CV_WRAP virtual void apply(InputArray image, InputArray knownForegroundMask, OutputArray fgmask, double learningRate=-1) CV_OVERRIDE = 0; | ^~~~~ ./opencv_contrib/modules/bgsegm/include/opencv2/bgsegm.hpp:153:26: error: 'virtual void cv::bgsegm::BackgroundSubtractorGMG::apply(cv::InputArray, cv::InputArray, cv::OutputArray, double)' marked 'override', but does not override 153 | CV_WRAP virtual void apply(InputArray image, InputArray knownForegroundMask, OutputArray fgmask, double learningRate=-1) CV_OVERRIDE = 0; | ^~~~~ ./opencv_contrib/modules/bgsegm/include/opencv2/bgsegm.hpp:269:26: error: 'virtual void cv::bgsegm::BackgroundSubtractorCNT::apply(cv::InputArray, cv::InputArray, cv::OutputArray, double)' marked 'override', but does not override 269 | CV_WRAP virtual void apply(InputArray image, InputArray knownForegroundMask, OutputArray fgmask, double learningRate=-1) CV_OVERRIDE = 0; | ^~~~~ ./opencv_contrib/modules/bgsegm/include/opencv2/bgsegm.hpp:330:26: error: 'virtual void cv::bgsegm::BackgroundSubtractorGSOC::apply(cv::InputArray, cv::InputArray, cv::OutputArray, double)' marked 'override', but does not override 330 | CV_WRAP virtual void apply(InputArray image, InputArray knownForegroundMask, OutputArray fgmask, double learningRate=-1) CV_OVERRIDE = 0; | ^~~~~ ./opencv_contrib/modules/bgsegm/include/opencv2/bgsegm.hpp:342:26: error: 'virtual void cv::bgsegm::BackgroundSubtractorLSBP::apply(cv::InputArray, cv::InputArray, cv::OutputArray, double)' marked 'override', but does not override 342 | CV_WRAP virtual void apply(InputArray image, InputArray knownForegroundMask, OutputArray fgmask, double learningRate=-1) CV_OVERRIDE = 0; | ^~~~~ 

/usr/bin/ld: CMakeFiles/opencv_bgsegm.dir/src/bgfg_gaussmix.cpp.o:(.data.rel.ro._ZTIN2cv6bgsegm27BackgroundSubtractorMOGImplE[_ZTIN2cv6bgsegm27BackgroundSubtractorMOGImplE]+0x10): undefined reference to `typeinfo for cv::bgsegm::BackgroundSubtractorMOG' /usr/bin/ld: CMakeFiles/opencv_bgsegm.dir/src/bgfg_gmg.cpp.o:(.data.rel.ro._ZTIN2cv6bgsegm27BackgroundSubtractorGMGImplE[_ZTIN2cv6bgsegm27BackgroundSubtractorGMGImplE]+0x10): undefined reference to `typeinfo for cv::bgsegm::BackgroundSubtractorGMG' /usr/bin/ld: CMakeFiles/opencv_bgsegm.dir/src/bgfg_gsoc.cpp.o:(.data.rel.ro._ZTIN2cv6bgsegm28BackgroundSubtractorGSOCImplE[_ZTIN2cv6bgsegm28BackgroundSubtractorGSOCImplE]+0x10): undefined reference to `typeinfo for cv::bgsegm::BackgroundSubtractorGSOC' /usr/bin/ld: CMakeFiles/opencv_bgsegm.dir/src/bgfg_gsoc.cpp.o:(.data.rel.ro._ZTIN2cv6bgsegm28BackgroundSubtractorLSBPImplE[_ZTIN2cv6bgsegm28BackgroundSubtractorLSBPImplE]+0x10): undefined reference to `typeinfo for cv::bgsegm::BackgroundSubtractorLSBP' /usr/bin/ld: CMakeFiles/opencv_bgsegm.dir/src/bgfg_subcnt.cpp.o:(.data.rel.ro._ZTIN2cv6bgsegm27BackgroundSubtractorCNTImplE[_ZTIN2cv6bgsegm27BackgroundSubtractorCNTImplE]+0x10): undefined reference to `typeinfo for cv::bgsegm::BackgroundSubtractorCNT'