anchor.diff:    src = fetchurl {
       url = tarballUrls version;
       hashOutput = false;
  -    sha256 = "ddac6111077d0a1612247587be238c5294dd0ee4d76dc7ba783cc55fb0337071";
  +    sha256 = "d1fea4128beef2bb30a470af6bafabccc503ced350534fb9dd8f5a53ffbae800";
     };
   
     buildInputs = [
  
positive.code:   passthru = {
      srcVerification = fetchurl rec {
        failEarly = true;
        urls = tarballUrls "1.7.3";
        pgpsigUrls = map (n: "${n}.sig") urls;
        pgpKeyFingerprint = "D869 2123 C406 5DEA 5E0F  3AB5 249B 39D2 4F25 E3B6";
        outputHash = "ddac6111077d0a1612247587be238c5294dd0ee4d76dc7ba783cc55fb0337071";
        inherit (src) outputHashAlgo;
      };
    };
  
negative.code:     "mirror://gnupg/libgcrypt/libgcrypt-${version}.tar.bz2"
    ];
  
    version = "1.7.5";
  in
  stdenv.mkDerivation rec {
    name = "libgcrypt-${version}";
  