anchor.diff:  }:
   
   let
  -  version = "4.3.6";
  +  version = "4.4.0";
   in
   stdenv.mkDerivation rec {
     name = "dhcp-${version}";
   
     src = fetchurl {
       url = "https://ftp.isc.org/isc/dhcp/${version}/${name}.tar.gz";
  +    multihash = "Qmb7wcUA5NjnWMKWK5TUNwzKpkmyQLpFqNH2dgRTuX2vuC";
       hashOutput = false;
  -    sha256 = "a41eaf6364f1377fe065d35671d9cf82bbbc8f21207819b2b9f33f652aec6f1b";
  +    sha256 = "4a90be0f22ad81c987f5584661b60a594f1b21c581b82bfba3ae60f89ae44397";
     };
   
     nativeBuildInputs = [
  
positive.code:   meta = with stdenv.lib; {
      description = "Dynamic Host Configuration Protocol (DHCP) tools";
      homepage = http://www.isc.org/products/DHCP/;
      license = licenses.isc;
      maintainers = with maintainers; [
        wkennington
      ];
  
negative.code:     "--enable-tracing"
      "--enable-delayed-ack"
      "--enable-dhcpv6"
      "--enable-dhcpv4o6"
      "--enable-relay-port"
      "--enable-paranoia"
      "--enable-early-chroot"
      "--enable-ipv4-pktinfo"
      "--disable-use-sockets"
      "--disable-log-pid"
      "--enable-binary-leases"
      #"--enable-libtool"
      "--without-libbind"
      "--with-ldap"
      "--with-ldapcrypto"
  