anchor.diff:  { stdenv
  -, fetchurl
  +, autoreconfHook
  +, fetchFromGitHub
   , python
   
   , openssl
   }:
   
   let
  -  version = "2.0.22";
  +  version = "2.1.7-rc";
   
     tarballUrls = version: [
       "https://github.com/libevent/libevent/releases/download/release-${version}-stable/libevent-${version}-stable.tar.gz"
  
positive.code:     patchShebangs event_rpcgen.py
    '';
  
    passthru = {
      srcVerification = fetchurl rec {
        failEarly = true;
        urls = tarballUrls "2.0.22";
  
negative.code:       inherit (src) outputHashAlgo;
        outputHash = "18qz9qfwrkakmazdlwxvjmw8p76g70n3faikwvdwznns1agw9hki";
      };
    };*/
  
    meta = with stdenv.lib; {
      description = "Event notification library";
  