Here is a port for asio. This is the standalone copy unlike the Boost integrated version.
Information for inst:asio-1.28.0 Comment: header-only C++ library for asynchronous I/O programming Description: Asio is a cross-platform C++ library for network and low-level I/O programming that provides developers with a consistent asynchronous model using a modern C++ approach.
asio.tar.gz
Description: application/tar-gz
