安装goolge cartographer提示无法找到Eigen3的解决办法之一

原链接:http://community.bwbot.org/topic/135

cartographer安装步骤一般为

cd cartographer
mkdir build
cd build
cmake ..
make  -j
sudo make install

执行cmake ..时如果提示如下错误

CMake Error at CMakeLists.txt:32 (find_package):By not providing "FindEigen3.cmake" in CMAKE_MODULE_PATH this project has asked CMake to find a package configuration file provided by "Eigen3", but CMake did not find one.
Could not find a package configuration file provided by "Eigen3" with any of the following names:
Eigen3Config.cmake
eigen3-config.cmake

如果系统确实已经安装过Eigen3 (sudo apt-get install libeigen3-dev)，请点击下载本文件 ,然后放入cartographer源码目录下的cmake文件夹内的modules内，例如/home/xiaoqiang/Documents/cartographer/cmake/modules

现在再次执行cmake ..　问题应该已解决