* When using coroutines created by calling
[@boost:/doc/html/boost_asio/reference/spawn.html `boost::asio::spawn`],
you will need to add the
[@boost:/libs/coroutine/index.html Boost.Coroutine]
library to your program.

* When using
[@boost:/doc/html/boost_asio/reference/ssl__stream.html `boost::asio::ssl::stream`],
you will need to add the
[@https://www.openssl.org/ OpenSSL]
library to your program.