anchor.diff:  , perl
   
   , coreutils
  +, cyrus-sasl
   , gnused
   , iproute
   , iputils
  +, krb5_lib
   , net-tools
   , openldap
   }:
   
  +let
  +  version = "4.3.5";
  +in
   stdenv.mkDerivation rec {
     name = "dhcp-${version}";
  -  version = "4.3.4";
   
     src = fetchurl {
       url = "https://ftp.isc.org/isc/dhcp/${version}/${name}.tar.gz";
       hashOutput = false;
  -    sha256 = "f5115aee3dd3e6925de4ba47b80ab732ba48b481c8364b6ebade2d43698d607e";
  +    sha256 = "eb95936bf15d2393c55dd505bc527d1d4408289cec5a9fa8abb99f7577e7f954";
     };
   
     nativeBuildInputs = [
  
positive.code:   ];
  
    buildInputs = [
      openldap
    ];
  
  
negative.code:     "--disable-use-sockets"
      "--disable-secs-byteorder"
      "--disable-log-pid"
      "--enable-binary-leases"
      "--without-libbind"
      "--with-ldap"
      "--with-ldapcrypto"
      "--with-ldap-gssapi"
      "--without-ldapcasa"
    ];
  
    preInstall = ''
  