src/mango/rebar.config.script

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%   http://www.apache.org/licenses/LICENSE-2.0
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HaveDreyfus = code:lib_dir(dreyfus) /= {error, bad_name}.

if not HaveDreyfus -> CONFIG; true ->
    CurrOpts = case lists:keyfind(erl_opts, 1, CONFIG) of
        {erl_opts, Opts} -> Opts;
        false -> []
    end,
    NewOpts = [{d, 'HAVE_DREYFUS'} | CurrOpts],
    lists:keystore(erl_opts, 1, CONFIG, {erl_opts, NewOpts})
end.