anchor.diff:  in
   stdenv.mkDerivation rec {
     name = "bind${optionalString (suffix != "") "-${suffix}"}-${version}";
  -  version = "9.10.3-P4";
  +  version = "9.10.4";
   
     src = fetchurl {
       url = "http://ftp.isc.org/isc/bind9/${version}/bind-${version}.tar.gz";
  -    sha256 = "0giys46ifypysf799w9v58kbaz1v3fbdzw3s212znifzzfsl9h1a";
  +    allowHashOutput = false;
  +    sha256 = "f8d412b38d5ac390275b943bde69f4608f67862a45487ec854b30e4448fcb056";
     };
   
     nativeBuildInputs = [
  
positive.code: { stdenv
  , fetchurl
  , libtool
  , docbook5_xsl
  
  , db
  
negative.code:     install -m 0644 $TMPDIR/$out/share/man/man1/{dig,host,nslookup,nsupdate}.1 $out/share/man/man1
    '';
  
    passthru = {
      srcVerified = fetchurl {
        failEarly = true;
        pgpsigUrls = map (n: "${n}.sha512.asc") src.urls;
        pgpKeyFile = dhcp.srcVerified.pgpKeyFile;
        inherit (src) urls outputHashAlgo outputHash;
      };
    };
  
    meta = with stdenv.lib; {
      homepage = "http://www.isc.org/software/bind";
      description = "Domain name server";
  