anchor.diff:    meta = with stdenv.lib; {
       description = "Dynamic Host Configuration Protocol (DHCP) tools";
       homepage = http://www.isc.org/products/DHCP/;
  -    license = licenses.isc;
  +    license = licenses.mpl2;
       maintainers = with maintainers; [
         wkennington
       ];
  
positive.code: }:
  
  let
    version = "4.3.6";
  in
  stdenv.mkDerivation rec {
    name = "dhcp-${version}";
  
    src = fetchurl {
      url = "https://ftp.isc.org/isc/dhcp/${version}/${name}.tar.gz";
      hashOutput = false;
      sha256 = "a41eaf6364f1377fe065d35671d9cf82bbbc8f21207819b2b9f33f652aec6f1b";
    };
  
    nativeBuildInputs = [
  
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"
  