CMake 查找特征不正确的结果

我正在尝试使用 CMake 编译带有Eigen的代码片段，但 CMake 似乎很难找到正确的路径，即使源代码在那里。

这是我CMakeLists.txt文件。

cmake_minimum_required(VERSION 3.14.2)
project(test)
# set default build type
if(NOT CMAKE_BUILD_TYPE)
set(CMAKE_BUILD_TYPE Release)
endif()

find_package(OpenCV 3 REQUIRED)
find_package (Eigen3 3.3 REQUIRED NO_MODULE)
include_directories(
include
${OpenCV_INCLUDE_DIRS}
${EIGEN3_INCLUDE_DIR}
)

add_executable(playground playground.cpp)
target_link_libraries(playground ${OpenCV_LIBS} Eigen3::Eigen)

这就是我在playground.cpp中导入标头的方式：

#include <iostream>
#include <vector>
#include <map>
#include <math.h>
#include <opencv2/core/core.hpp>
#include <opencv2/highgui/highgui.hpp>
#include <string>
#include <Eigen>

我的Eigen安装在/usr/include/eigen3下，这是目录结构：

yuqiong@yuqiong-G7-7588:/usr/include/eigen3$ ls
Eigen  signature_of_eigen3_matrix_library  unsupported

所以通往特征库的正确路径是/usr/include/eigen3/Eigen。

但是，当我运行cmake ..然后make上述CMakeLists.txt文件时，带有-LH标志，CMake 抱怨它找不到Eigen。这是它认为Eigen所在的路径：

yuqiong@yuqiong-G7-7588:/media/yuqiong/DATA/vignetting/catkin_ws/src/vig2/src/build$ cmake -LH ..
-- Configuring done
-- Generating done
-- Build files have been written to: /media/yuqiong/DATA/vignetting/catkin_ws/src/vig2/src/build
-- Cache values
// Choose the type of build, options are: None Debug Release RelWithDebInfo MinSizeRel ...
CMAKE_BUILD_TYPE:STRING=
// Install path prefix, prepended onto install directories.
CMAKE_INSTALL_PREFIX:PATH=/usr/local
// The directory containing a CMake configuration file for Eigen3.
Eigen3_DIR:PATH=/usr/local/share/eigen3/cmake
// The directory containing a CMake configuration file for OpenCV.
OpenCV_DIR:PATH=/opt/ros/kinetic/share/OpenCV-3.3.1-dev

这是它认为 Eigen 所在的文件夹的结构：

yuqiong@yuqiong-G7-7588:/usr/local/share/eigen3$ tree
.
└── cmake
├── Eigen3Config.cmake
├── Eigen3ConfigVersion.cmake
├── Eigen3Targets.cmake
└── UseEigen3.cmake

我很困惑为什么CMake会有这样的行为？在这种情况下，我怎样才能让它找到正确的Eigen路径？

所有这些环境设置都非常棘手，无法正确处理......