Replace BDB with LMDB
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Due to the toxic relicensing of BDB by Oracle, most OSS can no longer use BDB safely. Fortunately, there is a sane, truly free and open alternative, lmdb. It would be a worthwhile time investment to divest bogofilter of bdb and move to lmdb.
http://symas.com/lmdb/ for more information. See http://symas.com/mdb/#projects for a list of just some of the projects that have already made the switch.
LMDB support has been contributed by Steffen Nurpmeso and merged into the Subversion repository, this ticket will be closed once a release has been made that contains it.
WRT Oracle Berkeley DB licensing, Oracle still provides 5.3 for download, which was not using the AGPLv3 license.
LMDB support was released last year in bogofilter-1.2.5.