The package llfio provides two CMake targets:

    find_package(llfio CONFIG REQUIRED)

- If you want the header-only form of LLFIO:
    find_package(Threads REQUIRED)
    target_link_libraries(main PUBLIC llfio::hl)

- If you want the static library form of LLFIO:
    target_link_libraries(main PUBLIC llfio::sl)
