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问题：
CMake Error at CMakeLists.txt:4 (find_package):
By not providing “Findcatkin.cmake” in CMAKE_MODULE_PATH this project has
asked CMake to find a package configuration file provided by “catkin”, but
CMake did not find one.
Could not find a package configuration file provided by “catkin” with any
of the following names:
catkinConfig.cmake
catkin-config.cmake
Add the installation prefix of “catkin” to CMAKE_PREFIX_PATH or set
“catkin_DIR” to a directory containing one of the above files. If “catkin”
provides a separate development package or SDK, be sure it has been
installed.
解决办法
在CMakeLists.txt中加入
find_package( PkgConfig )
pkg_check_modules( EIGEN3 REQUIRED eigen3 )