Just to add some context to this, we're doing this as part of a FreeCAD effort and would eventually like to include Coin as a submodule.

I have tested as working as well with:

cmake_minimum_required(VERSION 3.10)

project(coin3d-test)

set(CMAKE_EXPORT_COMPILE_COMMANDS ON)
set(CMAKE_CXX_STANDARD 23)
set(CMAKE_BUILD_TYPE Debug)

set(COIN_BUILD_EGL 0)
set(COIN_BUILD_GLX 1)
set(COIN_BUILD_EXAMPLES OFF)
set(COIN_BUILD_TESTS OFF)
add_subdirectory(coin)

add_executable(main
    coin/examples/glfw/glfw.cpp
)

target_include_directories(main PRIVATE
    ${CMAKE_BINARY_DIR}/coin/include
    coin/include
)

target_compile_options(main PRIVATE -Wall -pedantic)

target_link_libraries(main PRIVATE Coin glfw GL)

Thanks for the PR it is highly appreciated. The broken Windows build is not related to your changes. It seems I need to do some adaptions (i.e. set a policy for FindBoost module) to make that work under Windows.

I am glad that you guys found the PR useful :)
I just wanted to include coin as a submodule in my SDL project but @tritao mentioned that this is something that FreeCAD also needs so I created the PR.