spout2 provides CMake targets:

    # SpoutGL
    find_package(Spout2 CONFIG REQUIRED)
    target_link_libraries(main PRIVATE Spout2::Spout)
    target_link_libraries(main PRIVATE Spout2::Spout_static)

    # SpoutLibrary
    target_link_libraries(main PRIVATE Spout2::SpoutLibrary)

    # SpoutDX
    target_link_libraries(main PRIVATE Spout2::SpoutDX)
    target_link_libraries(main PRIVATE Spout2::SpoutDX_static)