The package cudnn provides CMake variables:

    find_package(CUDNN REQUIRED)
    target_link_libraries(main PRIVATE ${CUDNN_LIBRARIES})
    target_include_directories(main PRIVATE ${CUDNN_INCLUDE_DIRS})

Or the following CMake target:

    find_package(CUDNN REQUIRED)
    target_link_libraries(main PRIVATE CuDNN::CuDNN)