cannot locate Berkeley DB during ./configure

greetings I am trying to compile Squidguard ( a redirector for squid ) on a 10.2.3 server. during ./configure i recieve an error becuase it cannot locate the Berkeley DB. By default the configure script looks in /local/Berkeley DB so i must change the config line by adding: ./configure --with-db=DIR BUT,....i don't know where the db directory is on OSX or is it even installed. any assistance would be helpfull. Thanks