* IO Backend (autodetected by default):
--with-select[=<path>] / --without-select
--with-poll[=<path>] / --without-poll
--with-devpoll[=<path>] / --without-devpoll
--with-epoll[=<path>] / --without-epoll
* IO Backend (autodetected by default):
--with-select[=<path>] / --without-select
--with-poll[=<path>] / --without-poll
--with-devpoll[=<path>] / --without-devpoll
--with-epoll[=<path>] / --without-epoll