bupshould now always include the effective group ID when retrieving groups via getgroups(2) (often via pythonos.getgroups()). That call is not required to include the effective group ID, and in the Debian buildds' current sbuild unshares, it doesn't.
make installshould now place bup-config(5) in the correct sectional directory.
Johannes Berg, Michael Tokarev, Rob Browning, and Robert Edmonds