anchor.diff:    passthru = {
       srcVerification = fetchurl {
         failEarly = true;
  -      url = tarballUrls "1.36.0";
  -      outputHash = "e9bb86157b88eda5a6844a232e039febbb52c1aa44b640acbbfabe729b8287fc";
  +      url = tarballUrls "1.38.0";
  +      outputHash = "ef75c761858241c6b4372fa6397aa0481a984b84b7b07c4ec7dc2d7b9eee87f8";
         inherit (src)
           outputHashAlgo;
         fullOpts = { };
  
positive.code:   src = fetchurl {
      urls = tarballUrls version;
      hashOutput = false;
      sha256 = "e9bb86157b88eda5a6844a232e039febbb52c1aa44b640acbbfabe729b8287fc";
    };
  
    buildInputs = optionals (!isLib) [
  
negative.code:     "https://github.com/tatsuhiro-t/nghttp2/releases/download/v${version}/nghttp2-${version}.tar.xz"
    ];
  
    version = "1.38.0";
  in
  stdenv.mkDerivation rec {
    name = "${prefix}nghttp2-${version}";
  