anchor.diff:      "--disable-samples"
     ];
   
  -  /*passthru = {
  +  passthru = {
       srcVerification = fetchurl rec {
         failEarly = true;
  -      urls = tarballUrls "2.0.22";
  +      urls = tarballUrls "2.1.8";
         pgpsigUrls = map (n: "${n}.asc") urls;
  -      pgpKeyFingerprint = "B35B F85B F194 89D0 4E28  C33C 2119 4EBB 1657 33EA";
  +      pgpKeyFingerprints = [
  +        "9E3A C83A 2797 4B84 D1B3  401D B860 8684 8EF8 686D"
  +      ];
         inherit (src) outputHashAlgo;
  -      outputHash = "18qz9qfwrkakmazdlwxvjmw8p76g70n3faikwvdwznns1agw9hki";
  +      outputHash = "965cc5a8bb46ce4199a47e9b2c9e1cae3b137e8356ffdad6d94d3b9069b71dc2";
       };
  -  };*/
  +  };
   
     meta = with stdenv.lib; {
       description = "Event notification library";
  
positive.code: stdenv.mkDerivation rec {
    name = "libevent-${version}";
  
    /*src = fetchurl {
      urls = tarballUrls version;
      hashOutput = false;
      sha256 = "18qz9qfwrkakmazdlwxvjmw8p76g70n3faikwvdwznns1agw9hki";
    };*/
  
    src = fetchFromGitHub {
      version = 2;
      owner = "libevent";
      repo = "libevent";
      rev = "release-${version}";
      sha256 = "70a1e1042a1035f2e0d0d2edcb5eae84ca718b69a26803bebf6115e72dd5db41";
    };
  
    nativeBuildInputs = [
      autoreconfHook
      python
    ];
  
  
negative.code: { stdenv
  , fetchurl
  , python
  
  , openssl
  }:
  
  let
    version = "2.1.8";
  
    tarballUrls = version: [
      "https://github.com/libevent/libevent/releases/download/release-${version}-stable/libevent-${version}-stable.tar.gz"
  