gfal2: fix cmake error by changing minimum required version in code

    ]

  );

  preConfigure =

    let

      cmakeFiles = [

        "CMakeLists.txt"

        "src/CMakeLists.txt"

        "src/core/CMakeLists.txt"

        "src/core/transfer/CMakeLists.txt"

        "src/plugins/CMakeLists.txt"

        "src/plugins/dcap/CMakeLists.txt"

        "src/plugins/file/CMakeLists.txt"

        "src/plugins/gridftp/CMakeLists.txt"

        "src/plugins/http/CMakeLists.txt"

        "src/plugins/lfc/CMakeLists.txt"

        "src/plugins/mock/CMakeLists.txt"

        "src/plugins/rfio/CMakeLists.txt"

        "src/plugins/sftp/CMakeLists.txt"

        "src/plugins/srm/CMakeLists.txt"

        "src/plugins/xrootd/CMakeLists.txt"

        "src/utils/CMakeLists.txt"

        "src/version/CMakeLists.txt"

      ];

    in

    ''

      for f in ${lib.escapeShellArgs cmakeFiles}; do

        substituteInPlace "$f" \

          --replace-fail 'cmake_minimum_required (VERSION 2.6)' \

                         'cmake_minimum_required (VERSION 3.10)'

      done

    '';

  cmakeFlags =

    (map (

      pluginName: