Linking errors PCL

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Hi,

I am trying to implement something like this: https://pcl.readthedocs.io/en/latest/... using lidar output.

I'm getting linking errors when trying to compile this.

colcon build --symlink-install 
Starting >>> cpp_tests
--- stderr: cpp_tests                             
** WARNING ** io features related to pcap will be disabled
/usr/bin/ld: CMakeFiles/ndt_test.dir/src/ndt_transform_calculator.cpp.o: in function `pcl::Registration<pcl::PointXYZ, pcl::PointXYZ, float>::align(pcl::PointCloud<pcl::PointXYZ>&, Eigen::Matrix<float, 4, 4, 0, 4, 4> const&)':
ndt_transform_calculator.cpp:(.text._ZN3pcl12RegistrationINS_8PointXYZES1_fE5alignERNS_10PointCloudIS1_EERKN5Eigen6MatrixIfLi4ELi4ELi0ELi4ELi4EEE[_ZN3pcl12RegistrationINS_8PointXYZES1_fE5alignERNS_10PointCloudIS1_EERKN5Eigen6MatrixIfLi4ELi4ELi0ELi4ELi4EEE]+0x242): undefined reference to `pcl::search::KdTree<pcl::PointXYZ, pcl::KdTreeFLANN<pcl::PointXYZ, flann::L2_Simple<float> > >::setPointRepresentation(std::shared_ptr<pcl::PointRepresentation<pcl::PointXYZ> const> const&)'
/usr/bin/ld: CMakeFiles/ndt_test.dir/src/ndt_transform_calculator.cpp.o: in function `pcl::Registration<pcl::PointXYZ, pcl::PointXYZ, float>::Registration()':
ndt_transform_calculator.cpp:(.text._ZN3pcl12RegistrationINS_8PointXYZES1_fEC2Ev[_ZN3pcl12RegistrationINS_8PointXYZES1_fEC5Ev]+0x69): undefined reference to `pcl::search::KdTree<pcl::PointXYZ, pcl::KdTreeFLANN<pcl::PointXYZ, flann::L2_Simple<float> > >::KdTree(bool)'
/usr/bin/ld: ndt_transform_calculator.cpp:(.text._ZN3pcl12RegistrationINS_8PointXYZES1_fEC2Ev[_ZN3pcl12RegistrationINS_8PointXYZES1_fEC5Ev]+0x98): undefined reference to `pcl::search::KdTree<pcl::PointXYZ, pcl::KdTreeFLANN<pcl::PointXYZ, flann::L2_Simple<float> > >::KdTree(bool)'
/usr/bin/ld: CMakeFiles/ndt_test.dir/src/ndt_transform_calculator.cpp.o: in function `pcl::VoxelGridCovariance<pcl::PointXYZ>::VoxelGridCovariance()':
ndt_transform_calculator.cpp:(.text._ZN3pcl19VoxelGridCovarianceINS_8PointXYZEEC2Ev[_ZN3pcl19VoxelGridCovarianceINS_8PointXYZEEC5Ev]+0xe7): undefined reference to `pcl::KdTreeFLANN<pcl::PointXYZ, flann::L2_Simple<float> >::KdTreeFLANN(bool)'
/usr/bin/ld: CMakeFiles/ndt_test.dir/src/ndt_transform_calculator.cpp.o: in function `pcl::KdTreeFLANN<pcl::PointXYZ, flann::L2_Simple<float> >::~KdTreeFLANN()':
ndt_transform_calculator.cpp:(.text._ZN3pcl11KdTreeFLANNINS_8PointXYZEN5flann9L2_SimpleIfEEED2Ev[_ZN3pcl11KdTreeFLANNINS_8PointXYZEN5flann9L2_SimpleIfEEED5Ev]+0x26): undefined reference to `pcl::KdTreeFLANN<pcl::PointXYZ, flann::L2_Simple<float> >::cleanup()'
/usr/bin/ld: CMakeFiles/ndt_test.dir/src/ndt_transform_calculator.cpp.o: in function `pcl::VoxelGridCovariance<pcl::PointXYZ>::filter(bool)':
ndt_transform_calculator.cpp:(.text._ZN3pcl19VoxelGridCovarianceINS_8PointXYZEE6filterEb[_ZN3pcl19VoxelGridCovarianceINS_8PointXYZEE6filterEb]+0x135): undefined reference to `pcl::KdTreeFLANN<pcl::PointXYZ, flann::L2_Simple<float> >::setInputCloud(std::shared_ptr<pcl::PointCloud<pcl::PointXYZ> const> const&, std::shared_ptr<std::vector<int, std::allocator<int> > const> const&)'
/usr/bin/ld: CMakeFiles/ndt_test.dir/src/ndt_transform_calculator.cpp.o:(.data.rel.ro._ZTVN3pcl19VoxelGridCovarianceINS_8PointXYZEEE[_ZTVN3pcl19VoxelGridCovarianceINS_8PointXYZEEE]+0x48): undefined reference to `pcl::VoxelGridCovariance<pcl::PointXYZ>::applyFilter(pcl::PointCloud<pcl::PointXYZ>&)'
/usr/bin/ld: CMakeFiles/ndt_test.dir/src/ndt_transform_calculator.cpp.o:(.data.rel.ro._ZTVN3pcl9VoxelGridINS_8PointXYZEEE[_ZTVN3pcl9VoxelGridINS_8PointXYZEEE]+0x48): undefined reference to `pcl::VoxelGrid<pcl::PointXYZ>::applyFilter(pcl::PointCloud<pcl::PointXYZ>&)'
/usr/bin/ld: CMakeFiles/ndt_test.dir/src/ndt_transform_calculator.cpp.o:(.data.rel.ro._ZTVN3pcl11KdTreeFLANNINS_8PointXYZEN5flann9L2_SimpleIfEEEE[_ZTVN3pcl11KdTreeFLANNINS_8PointXYZEN5flann9L2_SimpleIfEEEE]+0x10): undefined reference to `pcl::KdTreeFLANN<pcl::PointXYZ, flann::L2_Simple<float> >::setInputCloud(std::shared_ptr<pcl::PointCloud<pcl::PointXYZ> const> const&, std::shared_ptr<std::vector<int, std::allocator<int> > const> const&)'
/usr/bin/ld: CMakeFiles/ndt_test.dir/src/ndt_transform_calculator.cpp.o:(.data.rel.ro._ZTVN3pcl11KdTreeFLANNINS_8PointXYZEN5flann9L2_SimpleIfEEEE[_ZTVN3pcl11KdTreeFLANNINS_8PointXYZEN5flann9L2_SimpleIfEEEE]+0x28): undefined reference to `pcl::KdTreeFLANN<pcl::PointXYZ, flann::L2_Simple<float> >::nearestKSearch(pcl::PointXYZ const&, unsigned int, std::vector<int, std::allocator<int> >&, std::vector<float, std::allocator<float> >&) const'
/usr/bin/ld: CMakeFiles/ndt_test.dir/src/ndt_transform_calculator.cpp.o:(.data.rel.ro._ZTVN3pcl11KdTreeFLANNINS_8PointXYZEN5flann9L2_SimpleIfEEEE[_ZTVN3pcl11KdTreeFLANNINS_8PointXYZEN5flann9L2_SimpleIfEEEE]+0x40): undefined reference to `pcl::KdTreeFLANN<pcl::PointXYZ, flann::L2_Simple<float> >::radiusSearch(pcl::PointXYZ const&, double, std::vector<int, std::allocator<int> >&, std::vector<float, std::allocator<float> >&, unsigned int) const'
/usr/bin/ld: CMakeFiles/ndt_test.dir/src/ndt_transform_calculator.cpp.o:(.data.rel.ro._ZTVN3pcl11KdTreeFLANNINS_8PointXYZEN5flann9L2_SimpleIfEEEE[_ZTVN3pcl11KdTreeFLANNINS_8PointXYZEN5flann9L2_SimpleIfEEEE]+0x58): undefined reference to `pcl::KdTreeFLANN<pcl::PointXYZ, flann::L2_Simple<float> >::setEpsilon(float)'
/usr/bin/ld: CMakeFiles/ndt_test.dir/src/ndt_transform_calculator.cpp.o: in function `pcl ...