No way to record a live stream to WebM using ffmpeg?

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http://unix.stackexchange.com – I'm streaming from an mp4 source and so far I've managed to save clips as ogg (video: libtheora, audio: flac), but I'd like to save them in the WebM format. Unfortunately, WebM demands libvorbis for audio and when I try to do that: $ ffmpeg -t 60 -rtsp_transport udp -i rtsp:// -vcodec libvpx -acodec libvorbis -f webm test.webm ffmpeg version 0.10.5 Copyright (c) 2000-2012 the FFmpeg developers built on Oct 4 2012 19:17:43 with gcc 4.7.2 20120921 (Red Hat 4.7.2-2) configuration: --prefix=/usr --bindir=/usr/bin --datadir=/usr/share/ffmpeg --incdir=/usr/include/ffmpeg (HowTos)