- automatically disable arena allocator when run under valgrind (upstream
        issue 2422; patch 52)
    - add patch from Josh Boyer containing diff against upstream PyBSDDB to
        make the bsddb module compile against db-4.8 (patch 53, #544275); bump
        the necessary version of db4-devel to 4.8
    - patch setup.py so that it searches for db-4.8, and enable debug output
        for said search; make Setup.dist use db-4.8 (patch 54)