anchor.diff:    src = fetchurl {
       urls = tarballUrls version;
       hashOutput = false;
  -    sha256 = "9b7f5b09c3ca40a46118240bf476a5babf4bd93a1e4fde2337c308c4c5c3263a";
  +    sha256 = "e9bb86157b88eda5a6844a232e039febbb52c1aa44b640acbbfabe729b8287fc";
     };
   
     buildInputs = optionals (!isLib) [
  
positive.code:   passthru = {
      srcVerification = fetchurl {
        failEarly = true;
        url = tarballUrls "1.35.1";
        outputHash = "9b7f5b09c3ca40a46118240bf476a5babf4bd93a1e4fde2337c308c4c5c3263a";
        inherit (src)
          outputHashAlgo;
        fullOpts = { };
  
negative.code:     "https://github.com/tatsuhiro-t/nghttp2/releases/download/v${version}/nghttp2-${version}.tar.xz"
    ];
  
    version = "1.36.0";
  in
  stdenv.mkDerivation rec {
    name = "${prefix}nghttp2-${version}";
  