Warning: USE flag 'cpu_flags_x86_3dnowext' is used in ebuilds/metadata but is not defined in profiles/use.desc
Warning: USE flag 'cpu_flags_x86_3dnowext' used by media-plugins/mpg123-output-plugins but has no description in metadata.xml, use.local.desc or use.desc
Warning: USE flag 'cpu_flags_x86_3dnowext' used by media-sound/mpg123-base but has no description in metadata.xml, use.local.desc or use.desc
Warning: USE flag 'cpu_flags_x86_3dnowext' used by media-video/mplayer but has no description in metadata.xml, use.local.desc or use.desc