anchor.diff:      case Undef of
   	[] -> ok;
   	_ ->
  +	    Fd = open_log(Config, "undefined_functions"),
   	    foreach(fun ({MFA1,MFA2}) ->
   			    io:format("~s calls undefined ~s",
  +				      [format_mfa(MFA1),format_mfa(MFA2)]),
  +			    io:format(Fd, "~s ~s\n",
   				      [format_mfa(MFA1),format_mfa(MFA2)])
   		    end, Undef),
  +	    close_log(Fd),
   	    ?line ?t:fail({length(Undef),undefined_functions_in_otp})
  -
  -    end,
  -
  -    ok.
  +    end.
   
   hipe_filter(Undef) ->
       case erlang:system_info(hipe_architecture) of
  
positive.code: 	_ ->
  	    io:put_chars("The following functions have -deprecated() attributes,\n"
  			 "but are not listed in otp_internal:obsolete/3.\n"),
  	    ?line print_mfas(L),
  	    ?line ?t:fail({length(L),deprecated_but_not_obsolete})
      end.
  
  
negative.code: %%%
      
  
  print_mfas(Fd, [MFA|T]) ->
      io:format(Fd, "~s\n", [format_mfa(MFA)]),
      print_mfas(Fd, T);
  print_mfas(_, []) -> ok.
  
  format_mfa({M,F,A}) ->
      lists:flatten(io_lib:format("~s:~s/~p", [M,F,A])).
  
  open_log(Config, Name) ->
      PrivDir = ?config(priv_dir, Config),
      RunDir = filename:dirname(filename:dirname(PrivDir)),
      Path = filename:join(RunDir, "system_"++Name++".log"),
      {ok,Fd} = file:open(Path, [write]),
      Fd.
  
  close_log(Fd) ->
      ok = file:close(Fd).
  