--with-dnet (*) Compile with support for DECnet.
--with-ldap (*) Compile with support for the LDAP protocol (requires
installed LDAP libraries on the system).
+--with-postgresql (*) Compile with support for the PostgreSQL RDBMS (requires
+ installed PostreSQL libraries on the system).
--mail-locking=TYPE (*) Specify the locking to be used by movemail to prevent
concurrent updates of mail spool files. Valid types
are `lockf', `flock', and `dot'.