if (systemTypes.find(step->drv.platform) == systemTypes.end()) return false;

        /* Check that this machine is of the type required by the
           step. */
        if (!systemTypes.count(step->drv.platform)) return false;
        /* Check that the step requires all mandatory features of this
           machine. (Thus, a machine with the mandatory "benchmark"
           feature will *only* execute steps that require
           "benchmark".) The "preferLocalBuild" bit of a step is
           mapped to the "local" feature; thus machines that have
           "local" as a mandatory feature will only do
           preferLocalBuild steps. */

            if (step->requiredSystemFeatures.find(f) == step->requiredSystemFeatures.end()
                && !(step->preferLocalBuild && f == "local"))

            if (!step->requiredSystemFeatures.count(f)
                && !(f == "local" && step->preferLocalBuild))

        /* Check that the machine supports all features required by
           the step. */

            if (supportedFeatures.find(f) == supportedFeatures.end()) return false;

            if (!supportedFeatures.count(f)) return false;