rebar.config.script

case lists:keytake(eunit_opts, 1, CONFIG) of
    false -> CONFIG;
    {value, {eunit_opts, Opts}, CONFIG1} -> 
        GetEnvDef = fun(Default) ->
                            case os:getenv("SUREFIRE_DIR") of
                                false -> Default;
                                V     -> V
                            end
                    end,
        NewOpts = Opts ++ [{report, {eunit_surefire, [{dir, GetEnvDef("./surefire_results")}]}}],
        lists:keyreplace( eunit_opts
                        , 1
                        , CONFIG1
                        , {eunit_opts, NewOpts}
                        )
end.