anchor.diff:      "mirror://gnu/gettext/gettext-${version}.tar.xz"
     ];
   
  -  version = "0.19.8.1";
  +  version = "0.20";
   in
   stdenv.mkDerivation rec {
     name = "gettext-${version}";
  
positive.code:   passthru = {
      srcVerification = fetchurl rec {
        failEarly = true;
        urls = tarballUrls "0.19.8.1";
        pgpsigUrls = map (n: "${n}.sig") urls;
        pgpKeyFingerprint = "4622 25C3 B46F 3487 9FC8  496C D605 848E D7E6 9871";
        inherit (src) outputHashAlgo;
        outputHash = "105556dbc5c3fbbc2aa0edb46d22d055748b6f5c7cd7a8d99f8e7eb84e938be4";
      };
    };
  
  
negative.code:   src = fetchurl {
      urls = tarballUrls version;
      hashOutput = false;
      sha256 = "a248207fd726ca35c57fe9f01e748c36c60b864bb624b58f9983a0f98b633924";
    };
  
    postPatch = ''
  