I'm trying to build and install SC-A-LOAM on Ubuntu 20.04 and ROS Noetic.

I had two main errors after I run catkin_make, Errors are as below:

1. fatal error: opencv/cv.h: No such file or directory 44 | #include <opencv/cv.h>

I solved this error by editing "scanRegistration.cpp" file, I write #include <opencv2/opencv.hpp> instead of #include <opencv/cv.h>
I also changed set(CMAKE_CXX_FLAGS "-std=c 14") instead of set(CMAKE_CXX_FLAGS "-std=c 11") in CMakeLists.txt

2. error: ‘CV_LOAD_IMAGE_GRAYSCALE’ was not declared in this scope 91 | cv::Mat left_image = cv::imread(left_image_path.str(), CV_LOAD_IMAGE_GRAYSCALE);
   

I couldn't manage to solve this issue, any idea about it?