Version 6.1.0 is available upstream. Please consider updating! It seems that version 6.1.0 is available upstream, while the latest version in the Gentoo tree is 5.0.2. You think this warning is false? Read more about it here.
The libupnpp library, which provides the C++ interface for
upmpdcli and upplay, used to rely on the venerable libupnp library
(a.k.a pupnp: Portable UPnP) to provide the base UPnP protocol