rebar.config.script

case erlang:function_exported(rebar3, main, 1) of
    true ->
        %% rebar3
        CONFIG;
    false ->
        %% rebar 2.x or older
        NewConf = lists:keystore(deps_dir, 1, CONFIG, {deps_dir, "deps"}),
        Deps = [{jiffy, "0.*",
                 {git, "https://github.com/davisp/jiffy.git", {tag, "1.0.1"}}},
                {meck, ".*",
                 {git, "https://github.com/eproxus/meck.git", {tag, "0.8.13"}}},
                {eunit_formatters, ".*",
                 {git, "https://github.com/seancribbs/eunit_formatters.git", {tag, "v0.5.0"}}}
               ],
        lists:keystore(deps, 1, NewConf, {deps, Deps})
end.