anchor.diff:              end
       end.
   
  +reltool_vsn(ReltoolPath) ->
  +    AppFile = filename:join([ReltoolPath, "ebin", "reltool.app"]),
  +    case filelib:is_regular(AppFile) of
  +        true ->
  +            reltool_vsn_from_app();
  +        false ->
  +            reltool_vsn_from_path(ReltoolPath)
  +    end.
  +
  +reltool_vsn_from_app() ->
  +    ok = case application:load(reltool) of
  +             ok ->
  +                 ok;
  +             {error, {already_loaded, reltool}} ->
  +                 ok
  +         end,
  +    {ok, Vsn} = application:get_key(reltool, vsn),
  +    "reltool-" ++ Vsn.
  +
  +%% NOTE: OTP releases prior to R14B did not install
  +%% lib/reltool-x.y.z/ebin/reltool.app. Therefore, if we cannot find the app
  +%% file, we have to resort to getting the version string from reltool's lib_dir
  +%% path. This usually works, but as reported in
  +%% https://github.com/rebar/rebar/issues/415 there can be installations without
  +%% version strings in lib_dir paths. Given R13's age and that it's unusual to
  +%% have vsn-less lib_dir paths, this shouldn't be a problem.
  +%%
  +%% TODO: Once we require at least R14B04 (didn't check for existence of
  +%% ebin/reltool.app in R14 releases older than R14B04), simplify reltool_vsn/1
  +%% to get the version string only from the app key.
  +reltool_vsn_from_path(ReltoolPath) ->
  +    filename:basename(ReltoolPath).
  +
   process_overlay(Config, ReltoolConfig) ->
       TargetDir = rebar_rel_utils:get_target_dir(Config, ReltoolConfig),
   
  
positive.code:             ?ABORT("Reltool support requires the reltool application "
                     "to be installed!", []);
          Path ->
              ReltoolVsn = filename:basename(Path),
              case ReltoolVsn < "reltool-0.5.2" of
                  true ->
                      ?ABORT("Reltool support requires at least reltool-0.5.2; "
  
negative.code:     BaseVars = load_vars_file([proplists:get_value(overlay_vars, ReltoolConfig)]),
      OverlayVars = rebar_config:get_global(Config, overlay_vars, []),
      OverrideVars = load_vars_file(string:tokens(OverlayVars, ",")),
      M = fun merge_overlay_var/3,
      dict:merge(M, dict:merge(M, Vars0, BaseVars), OverrideVars).
  
  merge_overlay_var(_Key, _Base, Override) -> Override.
  