configure failure os x

[David Minor]

I'm having trouble getting bogofilter configured on an OS X box.  I'll 
admit, I'm pretty clueless when it comes to compiling from source, so 
this may be something pretty simple.  

I'm using the configure command '$./configure --with-db=/sw/include/db4'
and the error I'm getting is:
checking whether db_create is declared... yes
checking whether optreset is declared... yes
checking for db_create in -ldb... no
checking for db_create in -ldb-4.1... no
checking for db_create in -ldb-4... no
checking for db_create in -ldb4... no
checking for db_create in -ldb-3.3... no
checking for db_create in -ldb-3.2... no
checking for db_create in -ldb-3.1... no
checking for db_create in -ldb-3... no
checking for db_create in -ldb3... no
configure: error: Can not locate a suitable Berkeley DB library.  Use --
with-db=PATH to specify the path to a v3+ install directory


Any ideas on what I'm doing wrong?  
Thanks,
dm