anchor.diff:      cp -r sample/sample-config-files/ $out/share/doc/openvpn/examples
       cp -r sample/sample-keys/ $out/share/doc/openvpn/examples
       cp -r sample/sample-scripts/ $out/share/doc/openvpn/examples
  -
  -    ${optionalString useSystemd ''
  -      install -Dm755 ${update-resolved} $out/libexec/update-systemd-resolved
  -
  -      substituteInPlace $out/libexec/update-systemd-resolved \
  -        --replace '/usr/bin/env bash' '${stdenv.shell} -e' \
  -        --replace 'busctl call'       '${getBin systemd}/bin/busctl call' \
  -        --replace '(ip '              '(${getBin iproute}/bin/ip ' \
  -        --replace 'logger '           '${getBin utillinux}/bin/logger '
  -    ''}
  +  '' + optionalString useSystemd ''
  +    install -Dm555 ${update-resolved} $out/libexec/update-systemd-resolved
  +    wrapProgram $out/libexec/update-systemd-resolved \
  +      --prefix PATH : ${makeBinPath [ stdenv.shell iproute systemd utillinux ]}
     '';
   
     enableParallelBuilding = true;
  
positive.code:     sha256 = "1qpbllwlha7cffsd5dlddb8rl22g9rar5zflkz1wrcllhvfkl7v4";
    };
  
    nativeBuildInputs = [ pkgconfig ];
  
    buildInputs = [ lzo openssl ]
                    ++ optionals stdenv.isLinux [ pam iproute ]
  
negative.code: { stdenv, fetchurl, fetchpatch, pkgconfig, makeWrapper
  , iproute, lzo, openssl, pam
  , useSystemd ? stdenv.isLinux, systemd ? null, utillinux ? null
  , pkcs11Support ? false, pkcs11helper ? null,
  