anchor.diff:      "mirror://kernel/linux/utils/fs/xfs/xfsprogs/xfsprogs-${version}.tar"
     ];
   
  -  version = "4.14.0";
  +  version = "4.15.1";
   in
   stdenv.mkDerivation rec {
     name = "xfsprogs-${version}";
  
positive.code:   src = fetchurl {
      urls = map (n: "${n}.xz") (tarballUrls version);
      hashOutput = false;
      sha256 = "b1b710b268bc95d6f45eca06e1262c29eb38865a19cd4404e48ba446e043b7ec";
    };
  
    nativeBuildInputs = [
  
negative.code:   ];
  
    buildInputs = [
      attr
      libunistring
      readline
      util-linux_lib
    ];
  