Before deploying memcachedb, make sure that following packages installed:

Berkeley DB 4.5 or later:
http://www.oracle.com/database/berkeley-db/db/index.html

libevent 1.3d or later:
http://monkey.org/~provos/libevent/

now memcachedb is using fixed length key, so change below in "memcachedb.h" 
to your requirement:

#define END_LEN 32             -->>  keylen + vallen + 3
#define END_LEN_STR "31"       -->>  max keylen

then just type:
make

Have fun!!