报错如此下：
CMake Error at CMakeLists.txt:25 (find_package):
Found package configuration file:
/usr/local/lib/cmake/Pangolin/PangolinConfig.cmake
but it set Pangolin_FOUND to FALSE so package "Pangolin" is considered to
be NOT FOUND. Reason given by package:
Pangolin could not be found because dependency Eigen3 could not be found.
-- Configuring incomplete, errors occurred!
See also "/home/dongying/study/ManhattanSLAM/build/CMakeFiles/CMakeOutput.log".
See also "/home/dongying/study/ManhattanSLAM/build/CMakeFiles/CMakeError.log".
Makefile:940: recipe for target 'cmake_check_build_system' failed
make: *** [cmake_check_build_system] Error 1
解决办法：
不需要重新安装Pangolin及Eigen，修改CMakeLists.txt如下：
在find_package(Eigen3 REQUIRED)后加NO_MUDULE,
find_package(Eigen3 REQUIRED NO_MODULE)
然后重建编译即可成功！
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