anchor.diff:      "mirror://gnupg/libgcrypt/libgcrypt-${version}.tar.bz2"
     ];
   
  -  version = "1.7.1";
  +  version = "1.7.2";
   in
   stdenv.mkDerivation rec {
     name = "libgcrypt-${version}";
  
positive.code:   src = fetchurl {
      url = tarballUrls version;
      allowHashOutput = false;
      sha256 = "450d9cfcbf1611c64dbe3bd04b627b83379ef89f11406d94c8bba305e36d7a95";
    };
  
    buildInputs = [
  
negative.code:   passthru = {
      srcVerification = fetchurl rec {
        failEarly = true;
        urls = tarballUrls "1.7.2";
        pgpsigUrls = map (n: "${n}.sig") urls;
        pgpKeyFingerprint = "D869 2123 C406 5DEA 5E0F  3AB5 249B 39D2 4F25 E3B6";
        outputHash = "3d35df906d6eab354504c05d749a9b021944cb29ff5f65c8ef9c3dd5f7b6689f";
        inherit (src) outputHashAlgo;
      };
    };
  