PulseBuild = case os:getenv("USE_PULSE") of
                 false ->
                     false;
                 _ ->
                     true
             end,
case PulseBuild of
    true ->
        PulseOpts =
            [{pulse_no_side_effect,
              [{erlang,display,1},
               {os,getenv,1},
               {io,format,2},
               {io,format,3}
              ]},
             {pulse_side_effect,
              [  {does_not_exist_yet, some_func, '_'}

              , {machi_flu1_client, '_', '_'}
              , {machi_projection_store, '_', '_'}
              , {machi_proxy_flu1_client, '_', '_'}
              , {machi_pb_translate, '_', '_'}

              , {prim_file, '_', '_'}
              , {file, '_', '_'}
              , {filelib, '_', '_'}
              %% , {os, '_', '_'}
              ]},

             {pulse_replace_module,
              [ {gen_server, pulse_gen_server}
              , {application, pulse_application}
              , {supervisor, pulse_supervisor} ]}
            ],
        PulseCFlags = [{"CFLAGS", "$CFLAGS -DPULSE"}],
        UpdConfig = case lists:keysearch(eunit_compile_opts, 1, CONFIG) of
                        {value, {eunit_compile_opts, Opts}} ->
                            lists:keyreplace(eunit_compile_opts,
                                             1,
                                             CONFIG,
                                             {eunit_compile_opts, Opts ++ PulseOpts});
                        _ ->
                            [{eunit_compile_opts, PulseOpts} | CONFIG]
                    end,
        case lists:keysearch(port_env, 1, UpdConfig) of
            {value, {port_env, PortEnv}} ->
                lists:keyreplace(port_env,
                                 1,
                                 UpdConfig,
                                 {port_env, PortEnv ++ PulseCFlags});
            _ ->
                [{port_env, PulseCFlags} | UpdConfig]
        end;
    false ->
        CONFIG
end.