anchor.diff:  
     meta = with stdenv.lib; {
       description = "A robust and highly flexible tunneling application";
  -    downloadPage = "https://openvpn.net/index.php/open-source/downloads.html";
  +    downloadPage = "https://openvpn.net/community-downloads/";
       homepage = "https://openvpn.net/";
       license = licenses.gpl2;
       maintainers = with maintainers; [ viric ];
  
positive.code: 
  in stdenv.mkDerivation rec {
    pname = "openvpn";
    version = "2.4.7";
  
    src = fetchurl {
      url = "https://swupdate.openvpn.net/community/releases/${pname}-${version}.tar.xz";
      sha256 = "0j7na936isk9j8nsdrrbw7wmy09inmjqvsb8mw8az7k61xbm6bx4";
    };
  
    nativeBuildInputs = [ pkgconfig ];
  
negative.code:                   ++ optionals stdenv.isLinux [ pam iproute ]
                    ++ optional useSystemd systemd
                    ++ optional pkcs11Support pkcs11helper;
  
    configureFlags = optionals stdenv.isLinux [
      "--enable-iproute2"
  