ndbm(3) form of database uses two files
(.pag and .dir) for each
database. Databases cannot be shared by different architectures
across a network. If you intend to support aliasing in an efficient
manner, you should at least define this NDBM (or NEWDB, described
next) in your Build m4
The ndbm(3) routines are used primarily to look
up aliases. They can also be used to declare
dbm-type maps (Section 23.2.2)
with the K configuration command.
Library routines to support ndbm(3) are
available with most modern commercial versions of Unix. You might
have to specify library support with a -lndbm in
the confLIBS line of your
Build m4 file. If you are
running a precompiled sendmail binary, you can
use the -d0.1 debugging command-line switch (-d0.1) to determine if NDBM support is included (if
it appears in the list, support is included).
If, when you build sendmail, you get an error
something like this:
"map.c", line 23: syntax error at or near variable name "README"
you are using a defectively installed db
library. Versions of the db package from 2.0
through 2.3.1 can interfere with ndbm, unless
precautionary steps are taken. Read the file
sendmail/README for a description of how to
correct this problem.