mas-bandwidth-reliable provides a static library and header:

    find_path(RELIABLE_INCLUDE_DIR reliable.h)
    find_library(RELIABLE_LIBRARY reliable)
    target_include_directories(main PRIVATE ${RELIABLE_INCLUDE_DIR})
    target_link_libraries(main PRIVATE ${RELIABLE_LIBRARY})

mas-bandwidth-reliable is also discoverable via pkg-config as "reliable".
