anchor.diff:          type = types.package;
           default = pkgs.samba;
           defaultText = "pkgs.samba";
  -        example = literalExample "pkgs.samba4";
  +        example = literalExample "pkgs.samba3";
           description = ''
             Defines which package should be used for the samba server.
           '';
  
positive.code:         description = ''
            Additional global section and extra section lines go in here.
          '';
        };
  
        configText = mkOption {
  
negative.code:         description = ''
            Whether to enable Samba, which provides file and print
            services to Windows clients through the SMB/CIFS protocol.
  
            <note>
              <para>If you use the firewall consider adding the following:</para>
              <programlisting>
                networking.firewall.allowedTCPPorts = [ 139 445 ];
                networking.firewall.allowedUDPPorts = [ 137 138 ];
              </programlisting>
            </note>
          '';
        };
  
  