CMake error

[AIDRI]

`CMake Error at CMakeLists.txt:9 (find_package):
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.

-- Configuring incomplete, errors occurred!
See also "D:/SCpp/build/CMakeFiles/CMakeOutput.log".`

Hello, I tried to test the project, but when I run the command : cmake .. , I have this error, and I don't know how to patch it. If you can help me, it would be nice !

[EmbersArc]

What operating system are you on? If you're on a Linux distribution, you should be able to get it with any package manager. Maybe this will help as well: https://eigen.tuxfamily.org/dox/TopicCMakeGuide.html