[转]By not providing "FindEigen3.cmake" in CMAKE_MODULE_PATH this project has asked CMake to find...

在编译安装的时候出现如下问题,是Eigen3的Cmake依赖问题, 已经安装eigen3,但在项目的find_package(Eigen3 QUERIED)中,无法找到FindEigen3.Cmake. 

CMake Error at loam_velodyne/CMakeLists.txt:13 (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
 
  Add the installation prefix of "Eigen3" to CMAKE_PREFIX_PATH or set
  "Eigen3_DIR" to a directory containing one of the above files.  If "Eigen3"
  provides a separate development package or SDK, be sure it has been
  installed.

解决方案:

1. 找到 FindEigen3.cmake。也可以使用 locate FindEigen3.cmake 命令来查找。

2. 复制到项目文件夹下面,或者放在新建的cmake 文件夹内。

3. 修改项目 CMakeLists.txt。

set(CMAKE_MODULE_PATH ${CMAKE_CURRENT_SOURCE_DIR}) //添加此句
 
find_package(Eigen3 REQUIRED)
find_package(PCL REQUIRED)

如果是放在新建的cmake文件夹下,则添加此句:

set(CMAKE_MODULE_PATH ${PROJECT_SOURCE_DIR}/cmake)

That's Done, then re catkin_make。

原文链接：https://www.freesion.com/article/2528371979/

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