dev-cpp/asio
Asynchronous Network Library
USE Flags
doc
Global: Adds extra documentation (API, Javadoc, etc)
examples
Global: Install examples, usually source code
ssl
Global: Adds support for Secure Socket Layer connections
test
Global: Workaround to pull in packages needed to run with FEATURES=test. Portage-2.1.2 handles this internally, so don't set it in make.conf/package.use anymore