case erlang:function_exported(rebar3, main, 1) of

true ->

%% rebar3

CONFIG;

false ->

%% rebar 2.x or older

%% rebuild deps

Rebar3Deps = proplists:get_value(deps, CONFIG),

Rebar3TestDeps =

proplists:get_value(deps,

proplists:get_value(test,

proplists:get_value(profiles,

CONFIG))),

%% whenever adding a new Hex package dependency, this fun should be

%% updated

HexToRepo = fun(cowboy) -> "https://github.com/ninenines/cowboy.git";

(ranch) -> "https://github.com/ninenines/ranch.git";

(meck) -> "https://github.com/eproxus/meck.git"

end,

ConvertDep =

fun({DepName, {git, Repo, {ref, Tag}}}) ->

{DepName, ".*", {git, Repo, {tag, Tag}}};

({HexDepName, HexDepVersion}) ->

{HexDepName, ".*", {git, HexToRepo(HexDepName), {tag, HexDepVersion}}}

end,

Rebar2Deps = [ ConvertDep(Dep) || Dep <- Rebar3Deps ++ Rebar3TestDeps ],

lists:keystore(deps, 1, CONFIG, {deps, Rebar2Deps})

end.