1# Copyright 2017 Rene Rivera 2# Distributed under the Boost Software License, Version 1.0. 3# (See accompanying file LICENSE_1_0.txt or copy at 4# http://www.boost.org/LICENSE_1_0.txt) 5 6import feature ; 7 8#| tag::doc[] 9 10[[bbv2.builtin.features.allow]]`allow`:: 11This feature is used to allow specific generators to run. For example, Qt tools 12can only be invoked when Qt library is used. In that case, `<allow>qt` will be 13in usage requirement of the library. 14 15|# # end::doc[] 16 17feature.feature allow 18 : 19 : free ; 20