Ubuntu 20.04无法找到PCL，因为“`sudo install libpcl-dev`”安装后包含的目录不正确
操作系统: Ubuntu20.04
PCL信息：
Package: libpcl-dev
Version: 1.10.0+dfsg-5ubuntu1
Priority: extra
Section: universe/libdevel
Source: pcl
Origin: Ubuntu由sudo apt install libpcl-dev**.安装的I并像这样使用：**
cmake_minimum_required(VERSION 3.5)
project(test)# Default to C99
if(NOT CMAKE_C_STANDARD)set(CMAKE_C_STANDARD 99)
endif()# Default to C++14
if(NOT CMAKE_CXX_STANDARD)set(CMAKE_CXX_STANDARD 14)
endif()if(CMAKE_COMPILER_IS_GNUCXX OR CMAKE_CXX_COMPILER_ID MATCHES "Clang")add_compile_options(-Wall -Wextra -Wpedantic -Wno-unused-parameter)
endif()# find dependencies
find_package(PCL REQUIRED)生成项目时发生了一些错误：
CMake Error at /lib/x86_64-linux-gnu/cmake/pcl/PCLConfig.cmake:62 (message):PCL can not be found on this machine
Call Stack (most recent call first):/lib/x86_64-linux-gnu/cmake/pcl/PCLConfig.cmake:452 (pcl_report_not_found)CMakeLists.txt:37 (find_package)-- Configuring incomplete, errors occurred!我正在尝试调试/lib/x86_64-linux-gnu/cmake/pcl/PCLConfig.cmake:418-454**，中的cmake源代码cmake源代码如下所示：**
find_package(PkgConfig QUIET)file(TO_CMAKE_PATH "${PCL_DIR}" PCL_DIR)
if(WIN32 AND NOT MINGW)
# PCLConfig.cmake is installed to PCL_ROOT/cmakeget_filename_component(PCL_ROOT "${PCL_DIR}" PATH)
else()
# PCLConfig.cmake is installed to PCL_ROOT/share/pcl-x.yget_filename_component(PCL_ROOT "${CMAKE_CURRENT_LIST_DIR}/../../../.." ABSOLUTE)
endif()# check whether PCLConfig.cmake is found into a PCL installation or in a build tree
if(EXISTS "${PCL_ROOT}/include/pcl-${PCL_VERSION_MAJOR}.${PCL_VERSION_MINOR}/pcl/pcl_config.h")# Found a PCL installation# pcl_message("Found a PCL installation")set(PCL_CONF_INCLUDE_DIR "${PCL_ROOT}/include/pcl-${PCL_VERSION_MAJOR}.${PCL_VERSION_MINOR}")set(PCL_LIBRARY_DIRS "${PCL_ROOT}/lib/x86_64-linux-gnu")if(EXISTS "${PCL_ROOT}/3rdParty")set(PCL_ALL_IN_ONE_INSTALLER ON)endif()
elseif(EXISTS "${PCL_ROOT}/include/pcl/pcl_config.h")# Found a non-standard (likely ANDROID) PCL installation# pcl_message("Found a PCL installation")set(PCL_CONF_INCLUDE_DIR "${PCL_ROOT}/include")set(PCL_LIBRARY_DIRS "${PCL_ROOT}/lib")if(EXISTS "${PCL_ROOT}/3rdParty")set(PCL_ALL_IN_ONE_INSTALLER ON)endif()
elseif(EXISTS "${PCL_DIR}/include/pcl/pcl_config.h")# Found PCLConfig.cmake in a build tree of PCL# pcl_message("PCL found into a build tree.")set(PCL_CONF_INCLUDE_DIR "${PCL_DIR}/include") # for pcl_config.hset(PCL_LIBRARY_DIRS "${PCL_DIR}/lib/x86_64-linux-gnu")set(PCL_SOURCES_TREE "/build/pcl-gWGA5r/pcl-1.10.0+dfsg")
else()pcl_report_not_found("PCL can not be found on this machine")
endif()通过调试，我发现环境变量PCL_ROOT 设置为 / ， PCL_DIR 设置为 /lib/x86_64-linux-gnu/cmake/pcl**.因此，它无法找到正确的PCL包含目录(正确的PCL包含dir是** /usr/include/pcl-1.10**)并导致cmake错误。**)
那么，我的PCL有什么问题，如何通过find_package(PCL REQUIRED) 成功地找到PCL呢？非常感谢！
一个简单的“改变位置”的方法是创建一个符号链接。在这种情况下，你会：
sudo mkdir /lib/x86_64-linux-gnu/cmake/pcl/include
sudo ln -s /usr/include/pcl-1.10/pcl /lib/x86_64-linux-gnu/cmake/pcl/include/pcl那么你很可能会撞到：
No such file or directory
#include <Eigen/Core>
用同样的方式修复它：
sudo ln -s /usr/include/eigen3/Eigen /usr/include/Eigen
)
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