anchor.diff:      "mirror://gnupg/libgcrypt/libgcrypt-${version}.tar.bz2"
     ];
   
  -  version = "1.8.3";
  +  version = "1.8.4";
   in
   stdenv.mkDerivation rec {
     name = "libgcrypt-${version}";
  
positive.code:   passthru = {
      srcVerification = fetchurl rec {
        failEarly = true;
        urls = tarballUrls "1.8.3";
        pgpsigUrls = map (n: "${n}.sig") urls;
        pgpKeyFingerprints = [
          # Werner Koch
          "D869 2123 C406 5DEA 5E0F  3AB5 249B 39D2 4F25 E3B6"
          # NIIBE Yutaka
          "031E C253 6E58 0D8E A286  A9F2 2071 B08A 33BD 3F06"
        ];
        outputHash = "66ec90be036747602f2b48f98312361a9180c97c68a690a5f376fa0f67d0af7c";
        inherit (src) outputHashAlgo;
      };
    };
  
  
negative.code:   src = fetchurl {
      urls = tarballUrls version;
      hashOutput = false;
      sha256 = "f638143a0672628fde0cad745e9b14deb85dffb175709cacc1f4fe24b93f2227";
    };
  
    buildInputs = [
  