How to integrate leveldb database to FreeRadius-server-2.2.9

Hi all, I porting freeradius-server-2.2.9 to my system, I have a leveldb(https://github.com/google/leveldb) database to manage local users. I check the module support list in source code src\modules, not sure which module I should use to integrate with my leveldb, is it rlm_dbm? (looks like rlm_dbm depend on gdbm, but I don't want to use gdbm to manage my database) Do you already have another module name like "rlm_leveldb"? Thanks your support. Thanks, Ross