1. qt4：Ubuntu 20.04 LTS 安装qt4 library_ubuntu20.04安装qt4

2.本文下载过程可参考1：ubuntu20.04下安装pcl_ubuntu安装pcl_Yuannau_jk的博客-CSDN博客

参考2：Ubuntu 20.04.05安装PCL-1.12.0_no package 'metslib' found_zhiTjun的博客-CSDN博客

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VTK下载：VTK-7.1.1.zip

报错：
OpenGL_GL_PREFERENCE has not been set to "GLVND" or "LEGACY", so for   compatibility with CMake 3.10 and below the legacy GL library will be used. Call Stack (most recent call first):   CMake/vtkOpenGL.cmake:77 (find_package)   Rendering/OpenGL2/CMakeLi

解决：在/VTK-7.1.1/CMakeLists.txt文件中加入下面内容。

错误：
CMake Deprecation Warning at ThirdParty/libproj4/vtklibproj4/cmake/policies.cmake:2 (cmake_policy):
  The OLD behavior for policy CMP0022 will be removed from a future version
  of CMake.

  The cmake-policies(7) manual explains that the OLD behaviors of all
  policies are deprecated and that a policy should be set to OLD only under
  specific short-term circumstances.  Projects should be ported to the NEW
  behavior and not rely on setting a policy to OLD.
Call Stack (most recent call first):
  ThirdParty/libproj4/vtklibproj4/CMakeLists.txt:43 (include)

解决：在 /VTK-7.1.1/ThirdParty/libproj4/vtklibproj4/cmake/policies.cmake修改如下

最终结果：configure后框里没有任何红色报错。

PCL

参考：Ubuntu18.04安装PCL 1.9.1_振华OPPO的博客

PCL编译出错参考：Ubuntu20.04安装PCL1.8.0编译错误_小方只会百度的博客

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1.下载地址： Release PCL 1.12.0 · PointCloudLibrary/pcl · GitHub