anchor.diff:    src = fetchurl {
       urls = tarballUrls version;
       hashOutput = false;
  -    sha256 = "4879ce9ff3320f5344b910ee1c46ed5e366edc2272620cf17d8e762724d7df1e";
  +    sha256 = "ecb0c013141495e24bd6deca022b5a92097a7848a0c17c4e5af1243a97fa622e";
     };
   
     buildInputs = optionals (!isLib) [
  
positive.code:   passthru = {
      srcVerification = fetchurl {
        failEarly = true;
        url = tarballUrls "1.33.0";
        outputHash = "4879ce9ff3320f5344b910ee1c46ed5e366edc2272620cf17d8e762724d7df1e";
        inherit (src)
          outputHashAlgo;
        fullOpts = { };
  
negative.code:     "https://github.com/tatsuhiro-t/nghttp2/releases/download/v${version}/nghttp2-${version}.tar.xz"
    ];
  
    version = "1.34.0";
  in
  stdenv.mkDerivation rec {
    name = "${prefix}nghttp2-${version}";
  