LMDB 1.0 is an incompatible update from LMDB 0.9.  Existing databases
should be converted from the old to the new format using the
mdb_dump-0.9(1) [-a] and mdb_load(1) commands provided in this package:

  mdb_dump-0.9 old-db > old-db.txt
  mdb_load -f old-db.txt new-db
