anchor.diff:      case filelib:is_regular(Source) of
           true ->
               %% Actually exists, don't delete
  -            ok;
  +            false;
           false ->
               Target = target_base(OutDir, Source) ++ ".beam",
               ?DEBUG("Source ~s is gone, deleting previous beam file if it exists ~s", [Source, Target]),
               file:delete(Target),
  -            digraph:del_vertex(G, Source)
  +            digraph:del_vertex(G, Source),
  +            true
       end.
   
   opts_changed(NewOpts, Target) ->
  
positive.code: %% parse transforms, behaviours etc.) located in their directories or given
  %% InclDirs. Note that last modification times stored in vertices already respect
  %% dependencies induced by given graph G.
  init_erlcinfo(InclDirs, Erls, Dir) ->
      G = digraph:new([acyclic]),
      try restore_erlcinfo(G, InclDirs, Dir)
      catch
  
negative.code: 
      OutDir1 = proplists:get_value(outdir, ErlOpts, OutDir),
  
      G = init_erlcinfo(proplists:get_all_values(i, ErlOpts), AllErlFiles, Dir, OutDir),
  
      NeededErlFiles = needed_files(G, ErlOpts, Dir, OutDir1, AllErlFiles),
      {ErlFirstFiles, ErlOptsFirst} = erl_first_files(Config, ErlOpts, Dir, NeededErlFiles),
  