Regarding issues with Chrono CMake commands or CMake GUI build, compile, and installation instructions.

[Zero]

Hello All,
 I want to use Chrono's simulation as a third-party library plugin for Unreal to create a physics simulation system.

I encountered some issues while trying to build, compile, and install with CMake:
Regardless of whether I use CMake GUI or the CMake command, the Eigen header files are not included in the install directory.

[Zero]

The INSTALL file in the Eigen library states that it can be copied manually. However, I would prefer to initialize and install all the module contents correctly through the build system to ensure the proper installation of the plugin.

[Zero]

I found that the Unreal source code also has the Eigen library in its third-party folder. I did a rough comparison of the files provided by the official Eigen library and those in Unreal, and most files are essentially the same. However, when I tried to use CMake to call the Unreal third-party library to build the project, CMake did not report any errors. Yet, after the project was built and opened, I found that the INCLUDE could not reference the header files of the Eigen library.