anchor.diff:  }:
   
   let
  -  version = "1.33";
  +  version = "1.34";
   
     tarballUrls = version: [
       "mirror://gnu/libidn/libidn-${version}.tar.gz"
  
positive.code:   passthru = {
      srcVerification = fetchurl {
        failEarly = true;
        urls = tarballUrls "1.33";
        pgpsigUrls = map (n: "${n}.sig") src.urls;
        pgpKeyFingerprint = "9AA9 BDB1 1BB1 B99A 2128  5A33 0664 A769 5426 5E8C";
        inherit (src) outputHashAlgo;
        outputHash = "44a7aab635bb721ceef6beecc4d49dfd19478325e1b47f3196f7d2acc4930e19";
      };
    };
  
  
negative.code:   src = fetchurl {
      urls = tarballUrls version;
      hashOutput = false;
      sha256 = "3719e2975f2fb28605df3479c380af2cf4ab4e919e1506527e4c7670afff6e3c";
    };
  
    postPatch = ''
  