anchor.diff:  
   stdenv.mkDerivation rec {
     pname = "samba";
  -  version = "4.12.6";
  +  version = "4.13.0";
   
     src = fetchurl {
       url = "mirror://samba/pub/samba/stable/${pname}-${version}.tar.gz";
  -    sha256 = "1v3cmw40csmi3jd8mhlx4bm7bk4m0426zkyin7kq11skwnsrna02";
  +    sha256 = "1xp7mmy5a892g5c56n7zz3l2kbgyrqn3y50lqq5aa2nvx2p547gi";
     };
   
     outputs = [ "out" "dev" "man" ];
  
positive.code:     python
      readline
      popt
      jansson
      libbsd
      libarchive
  
negative.code: , docbook_xml_dtd_45
  , readline
  , popt
  , dbus
  , libbsd
  , libarchive
  , zlib
  