import! [metadata, rule_hint=cxx.link] asio = libasio%lib{asio} exe{driver}: cxx{driver} $asio if ($cxx.target.class == 'windows') cxx.poptions += -D_WIN32_WINNT=0x0601 if $($asio: libasio.ssl) cxx.poptions += "-DLIBASIO_TESTS_SSL_ENABLED"