Audacious player ebuild misses 'http' USE flag enabled by default what results in .m3u and .pls files being rejected (cannot open or add URL to stream internet radio stations).
Issue solved locally by adding 'media-plugins/audacious-plugins http' to /etc/portage/package.use and re-emerge of the package.
Would be great to have it compiled by default: listening to url streams is one of basics services of music players currently.