That said, I did a little googling and according to http://www.omachonuogali.com/oss/tokyocabinet/1.4.41/ChangeLog, the metasearch feature was added to TokyoCabinet in version 1.4.30. Perhaps you've installed an older version of TokyoCabinet?
Meanwhile, we'd be curious to hear how you're using bud and ODK together -- sounds interesting!
Joe