freebsd6.1 ports安装，openldap启动失败，请帮忙看看。
显示错误：
slapd[98306]: sql_select option missing
slapd[98306]: auxpropfunc error no mechanism available
slapd -d 256：
@(#) $OpenLDAP: slapd 2.3.38 (Oct 23 2007 22:28:25) $
root@xena.abc.org:/usr/ports/net/openldap23-server/work/openldap-2.3.38/servers/slapd
Oct 24 08:49:47 xena slapd[98306]: sql_select option missing
Oct 24 08:49:47 xena slapd[98306]: auxpropfunc error no mechanism available
bdb_db_open: Warning - No DB_CONFIG file found in directory /var/db/openldap-data: (2)
Expect poor performance for suffix dc=abc.org.
slapd starting
以下是slapd.conf:
# See slapd.conf(5) for details on configuration options.
# This file should NOT be world readable.
#
include /usr/local/etc/openldap/schema/core.schema
include /usr/local/etc/openldap/schema/cosine.schema
include /usr/local/etc/openldap/schema/nis.schema
include /usr/local/etc/openldap/schema/extmail.schema
# Define global ACLs to disable default read access.
# Do not enable referrals until AFTER you have a working directory
# service AND an understanding of referrals.
#referral ldap://root.openldap.org
pidfile /var/run/openldap/slapd.pid
argsfile /var/run/openldap/slapd.args
# Load dynamic backend modules:
modulepath /usr/local/libexec/openldap
moduleload back_bdb
moduleload back_ldap
# moduleload back_ldbm
# moduleload back_passwd
# moduleload back_shell
# Sample security restrictions
# Require integrity protection (prevent hijacking)
# Require 112-bit (3DES or better) encryption for updates
# Require 63-bit encryption for simple bind
# security ssf=1 update_ssf=112 simple_bind=64
# Sample access control policy:
# Root DSE: allow anyone to read it
# Subschema (sub)entry DSE: allow anyone to read it
# Other DSEs:
# Allow self write access
# Allow authenticated users read access
# Allow anonymous users to authenticate
# Directives needed to implement policy:
# access to dn.base="" by * read
# access to dn.base="cn=Subschema" by * read
# access to *
# by self write
# by users read
# by anonymous auth
#
# if no access controls are present, the default policy
# allows anyone and everyone to read anything but restricts
# updates to rootdn. (e.g., "access to * by * read"
#
# rootdn can always read and write EVERYTHING!
#######################################################################
# BDB database definitions
#######################################################################
database bdb
suffix "dc=abc.org"
rootdn "cn=Manager,dc=abc.org"
# Cleartext passwords, especially for the rootdn, should
# be avoid. See slappasswd( and slapd.conf(5) for details.
# Use of strong authentication encouraged.
rootpw secret
# The database directory MUST exist prior to running slapd AND
# should only be accessible by the slapd and slap tools.
# Mode 700 recommended.
directory /var/db/openldap-data
# Indices to maintain
index objectClass eq
index mail,active,virtualDomain,mailLocalAddress eq,pres
# Performance tuning directives
sizelimit 5000
threads 8
idletimeout 14400
cachesize 10000
checkpoint 256 15
