The package klein:x64-windows provides CMake targets:

    find_package(klein CONFIG REQUIRED)
    target_link_libraries(main PRIVATE klein::klein)

    # Or use the C++ 11 version
    target_link_libraries(main PRIVATE klein::klein_cxx11)

    # Or use the SSE4.1 version
    target_link_libraries(main PRIVATE klein::klein_sse42)
