anchor.diff:          outputHash
           outputHashAlgo
           urls;
  -      pgpsigUrl = map (n: "${n}.sign") (tarballUrls version);
  -      pgpKeyFingerprints = [
  -        # Dave Chinner
  -        "9893 A827 C19F 7D96 164A  38FF ADE8 2947 F475 FA1D"
  -        # Eric R. Sandeen
  -        "2B81 8591 9E8D 2489 8186  9DED 20AE 1692 E13D DEE0"
  -      ];
         failEarly = true;
  -      pgpDecompress = true;
  +      fullOpts = {
  +        pgpDecompress = true;
  +        pgpsigUrl = map (n: "${n}.sign") (tarballUrls version);
  +        pgpKeyFingerprints = [
  +          # Dave Chinner
  +          "9893 A827 C19F 7D96 164A  38FF ADE8 2947 F475 FA1D"
  +          # Eric R. Sandeen
  +          "2B81 8591 9E8D 2489 8186  9DED 20AE 1692 E13D DEE0"
  +        ];
  +      };
       };
     };
   
  
positive.code:   src = fetchurl {
      urls = map (n: "${n}.xz") (tarballUrls version);
      hashOutput = false;
      sha256 = "f53f5169cb98cfca471ddea30092738c427ba284c5356e01b45dd1ae3b297e0d";
    };
  
    nativeBuildInputs = [
  
negative.code:     "mirror://kernel/linux/utils/fs/xfs/xfsprogs/xfsprogs-${version}.tar"
    ];
  
    version = "4.18.0";
  in
  stdenv.mkDerivation rec {
    name = "xfsprogs-${version}";
  