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