abcde needs either vorbis-tools and/or id3v2 (not in gentoo) to run. A depends on vorbis-tools would fix the problem for those creating ogg files. A package for id3v2 would need to be created for the id3v2. I took a shot at it but couldn't get id3v2 to compile with the id3lib in gentoo. I think the author (or someone with more C/C++) knowledge then myself will need to fix the current id3v2 program to compile with the current id3libs.
added vorbis-tools to DEPEND...