std::set<std::string> requiredSystemFeatures;

        // FIXME: check features

        for (auto & f : mandatoryFeatures)
            if (step->requiredSystemFeatures.find(f) == step->requiredSystemFeatures.end()) return false;
        for (auto & f : step->requiredSystemFeatures)
            if (supportedFeatures.find(f) == supportedFeatures.end()) return false;

            for (auto & f : machine->mandatoryFeatures)
                machine->supportedFeatures.insert(f);

            BuildStepStatus buildStepStatus;

            BuildStepStatus buildStepStatus = bssFailed;

    {
        auto i = step->drv.env.find("requiredSystemFeatures");
        if (i != step->drv.env.end())
            step->requiredSystemFeatures = tokenizeString<std::set<std::string>>(i->second);
    }