anchor.diff:    src = fetchurl {
       urls = tarballUrls version;
       hashOutput = false;
  -    sha256 = "3edb957744905412f30de3e25da18682cbe509541e18cd3b8f9df695a075da49";
  +    sha256 = "ece926fa5719d17a7ad8da618712cfa2f8a796ab2f2af9d544c5bb093383b1ea";
     };
   
     postPatch = ''
  
positive.code:   passthru = {
      srcVerification = fetchurl rec {
        failEarly = true;
        urls = tarballUrls "1.28";
        pgpsigUrls = map (n: "${n}.sig") urls;
        inherit (gnupg.srcVerification) pgpKeyFingerprints;
        outputHash = "3edb957744905412f30de3e25da18682cbe509541e18cd3b8f9df695a075da49";
        inherit (src) outputHashAlgo;
      };
    };
  
negative.code:     "mirror://gnupg/libgpg-error/libgpg-error-${version}.tar.bz2"
    ];
  
    version = "1.29";
  in
  stdenv.mkDerivation rec {
    name = "libgpg-error-${version}";
  