anchor.diff:    ];
   
     brotliCmd = concatStringsSep " " [
  -    "${brotli}/bin/brotli"
  +    "${brotli.bin}/bin/brotli"
       "-6"
       "-c"
     ];
   
     xzCmd = concatStringsSep " " [
  -    "${xz}/bin/xz"
  +    "${xz.bin}/bin/xz"
       "-9"
       "-e"
       "-c"
  
positive.code:     tar
      xz;
  
    inherit (lib)
      concatStringsSep;
  
    tarCmd = concatStringsSep " " [
      "${tar}/bin/tar"
      "--sort=name"
      "--owner=0"
      "--group=0"
  
negative.code:   passthru = {
      inherit
        brotli
        version;
      tar = tar';
    };
  
    meta = with lib; {
  