anchor.diff:    src = fetchurl {
       urls = map (n: "${n}.xz") (tarballUrls version);
       hashOutput = false;
  -    sha256 = "b1b710b268bc95d6f45eca06e1262c29eb38865a19cd4404e48ba446e043b7ec";
  +    sha256 = "27c36de9346a274143ad06c65b2fdbafd2806f3f37fa2c1235a08ed920d2bf3c";
     };
   
     nativeBuildInputs = [
  
positive.code:     "mirror://kernel/linux/utils/fs/xfs/xfsprogs/xfsprogs-${version}.tar"
    ];
  
    version = "4.14.0";
  in
  stdenv.mkDerivation rec {
    name = "xfsprogs-${version}";
  
negative.code:   ];
  
    buildInputs = [
      attr
      libunistring
      readline
      util-linux_lib
    ];
  