$ sudo apt-get install -y ros-melodic-navigation ros-melodic-robot-localization ros-melodic-robot-state-publisher

$ wget -O gtsam.zip https://github.com/borglab/gtsam/archive/4.0.2.zip
$ unzip gtsam.zip
$ cd gtsam-4.0.2/
$ mkdir build && cd build
$ cmake -DGTSAM_BUILD_WITH_MARCH_NATIVE=OFF ..
$ sudo make install -j8

$ sudo apt-get install -y cmake libgoogle-glog-dev libatlas-base-dev libsuitesparse-dev
$ wget http://ceres-solver.org/ceres-solver-1.14.0.tar.gz
$ tar zxf ceres-solver-1.14.0.tar.gz
$ mkdir ceres-bin
$ mkdir solver && cd ceres-bin
$ cmake ../ceres-solver-1.14.0 -DEXPORT_BUILD_DIR=ON -DCMAKE_INSTALL_PREFIX="../solver"  #good for build without being root privileged and at wanted directory
$ make -j8 # 8 : number of cores
$ make test
$ make install

$ cd ~/your_workspace/src
$ git clone https://github.com/RobustFieldAutonomyLab/LeGO-LOAM.git
$ cd ..
$ catkin build

$ cd ~/your_workspace/src
$ git clone https://github.com/TixiaoShan/LIO-SAM.git
$ cd ..
$ catkin build

$ cd ~/your_workspace/src
$ git clone https://github.com/TixiaoShan/LVI-SAM.git
$ cd ..
$ catkin build

// cv::cvtColor(image, aux, CV_RGB2GRAY);
cv::cvtColor(image, aux, cv::COLOR_RGB2GRAY);