As suggested by Diego on the mailing list, it would be better if we used: 1) USE=upnp for port forwarding using UPnP-IGD, 2) USE=dlna for multimedia magic using UPnP/DLNA. This way, people who only want port forwarding using UPnP wouldn't get additional dependencies and code for DLNA which they have no use for. Thus, please change the USE=upnp flag to USE=dlna in the ebuild.
We reached a consensus that the flag will be named USE=upnp-av. It is a global flag now.
Fixed, thanks. >*grilo-plugins-0.2.5 (15 Dec 2012) > > 15 Dec 2012; Alexandre Rostovtsev <tetromino@gentoo.org> > grilo-plugins-0.1.18.ebuild, grilo-plugins-0.1.20.ebuild, > -grilo-plugins-0.2.3.ebuild, grilo-plugins-0.2.4.ebuild, > +grilo-plugins-0.2.5.ebuild, metadata.xml: > Version bump. Rename upnp USE flag to upnp-av (bug #435772, thanks to Michał > Górny). Drop old.