anchor.diff:      optionals
       optionalString;
   
  -  version = "9.11.2-P1";
  +  version = "9.12.0";
   in
   stdenv.mkDerivation rec {
     name = "bind${optionalString (suffix != "") "-${suffix}"}-${version}";
   
     src = fetchurl {
       url = "https://ftp.isc.org/isc/bind9/${version}/bind-${version}.tar.gz";
  -    multihash = "QmSvhppMPkAR76qgMwL9xDVMfSgpYnt7hgiZwyTuDZVfVk";
  +    multihash = "QmUxfY25Ra6LbJyhyakP61whVEdGghRKH8Lj7pN9KBwreD";
       hashOutput = false;
  -    sha256 = "cec31548832fca3f85d95178d4019b7d702039e8595d4c93914feba337df1212";
  +    sha256 = "29870e9bf9dcc31ead3793ca754a7b0236a0785a7a9dc0f859a0bc42e19b3c82";
     };
   
     nativeBuildInputs = [
  
positive.code:     libxml2
      lmdb
      ncurses
      openssl_1-0-2
      pythonPackages.python
      pythonPackages.ply
      readline
  
negative.code:     "--disable-fixed-rrset"
      "--enable-rpz-nsip"
      "--enable-rpz-nsdname"
      "--with-docbook-xsl=${docbook-xsl-ns}/share/xsl/docbook"
      "--with-idn=${idnkit}"
      "--without-atf"
  