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from the update notes for the latest subversion package in Debian, which is now installed on hemlock:

If you are using BDB repositories, you will get "DB_VERSION_MISMATCH" errors when you try to use them with recent Subversion, due to the move to db4.6. To fix this, just run 'svnadmin recover /path/to/repo' for each affected repository. We apologise for the inconvenience.

- river.