对我来说，当我安装eigen3包（例如使用-DCMAKE_INSTALL_PREFIX = / home / doriad / install），并且还将使用eigen3的cmake包的CMAKE_INSTALL_PREFIX变量设置为同一目录。

It worked for me, when I installed the eigen3 package (e.g. using -DCMAKE_INSTALL_PREFIX=/home/doriad/install), and also set the CMAKE_INSTALL_PREFIX variable of the cmake package that is using eigen3 to the same directory.

由于findscripts的问题，我实际上开始使用 pkg -config 。为此，您需要在eigen3 cmake中启用pkg-config支持，并在您自己的cmake脚本中使用pkg-config宏。优点是您不再需要设置任何环境变量了。

Because of the problems with findscripts, I've actually started using pkg-config instead. For that you need to enable pkg-config support in the eigen3 cmake, and use the pkg-config macro in your own cmake script. Advantage is that you don't need to set any environment variables anymore.

find_package( PkgConfig )
pkg_check_modules( EIGEN3 REQUIRED eigen3 )
include_directories( ${EIGEN3_INCLUDE_DIRS} )