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/usr/include/asio/unyield.hpp is in libasio-dev 1:1.10.8-1.

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//
// unyield.hpp
// ~~~~~~~~~~~
//
// Copyright (c) 2003-2016 Christopher M. Kohlhoff (chris at kohlhoff dot com)
//
// Distributed under the Boost Software License, Version 1.0. (See accompanying
// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
//

#ifdef reenter
# undef reenter
#endif

#ifdef yield
# undef yield
#endif

#ifdef fork
# undef fork
#endif