pclConfig.cmake or PCLConfig.cmake

  Could not find a package configuration file provided by "pcl" (requested
  version 1.8) with any of the following names:

    pclConfig.cmake
    pcl-config.cmake

在 find_package(PCL 1.8 REQUIRED )之前添加set(PCL_DIR /usr/share/pcl-1.8/PCLConfig.cmake)，需要注意的地方pclConfig.cmake 对应find_package里面的pcl，而PCLConfig.cmake对应于find_package里面的PCL。

pcl安装目录任意，比如/home/gary/PCL/install_dir

 那么通过/home/gary/PCL/install_dir/share/pcl-1.11/可以找到安装目录的详细信息

在使用pcl的时候，就可以如下：

cmake_minimum_required(VERSION 3.10)
project(icp)

#set(CMAKE_CXX_STANDARD 14)
add_compile_options(-std=c++14)
set(PCL_DIR /home/gary/PCL/install_dir/share/pcl-1.11/)
find_package(PCL REQUIRED)

include_directories(${PCL_INCLUDE_DIRS})
link_directories(${PCL_LIBRARY_DIRS})
add_definitions(${PCL_DEFINITIONS})
add_executable(icp main.cpp)

target_link_libraries (icp ${PCL_LIBRARIES})

 根这里的意思差不多https://zhuanlan.zhihu.com/p/338725301