anchor.diff:  { stdenv, fetchurl, openssl }:
   
   let
  -  version = "6.4.2";
  +  version = "6.4.3";
   in
   stdenv.mkDerivation {
     pname = "fetchmail";
  
positive.code: 
    src = fetchurl {
      url = "mirror://sourceforge/fetchmail/fetchmail-${version}.tar.xz";
      sha256 = "0c563if3kribnj771l14aj06irmrlhm61dc68w6dp7zj4qrnn7z2";
    };
  
    buildInputs = [ openssl ];
  
negative.code:   configureFlags = [ "--with-ssl=${openssl.dev}" ];
  
    meta = {
      homepage = "https://www.fetchmail.info/";
      description = "A full-featured remote-mail retrieval and forwarding utility";
      longDescription = ''
        A full-featured, robust, well-documented remote-mail retrieval and
  