How to manually install PCL on ubuntu 18.04

1. Firstly, need to check which version pcl you need to install on your ubuntu system.

PCL download link:

https://github.com/PointCloudLibrary/pcl/releases?page=2https://github.com/PointCloudLibrary/pcl/releases?page=2

Find your version: pcl-1.9.1

Then click Assets, and download the source code.zip

2. unzip source_code.zip

3. cd source_code

mkdir build && cd build

cmake ..

make -j2 && sudo make install

please enter into /usr/local/include

the pcl-1.9 can be found here.