Openldap : overlay accesslog not found

I am trying to configure accesslog. I have changed the slapd.conf file and trying to test using slaptest but i am getting error while executing slaptest -f /etc/openldap/slapd.conf.

slapd.conf configuration:

  # See slapd.conf(5) for details on configuration options.  
  # This file should NOT be world readable.
   include     /etc/openldap/schema/core.schema
   include     /etc/openldap/schema/cosine.schema
   include     /etc/openldap/schema/inetorgperson.schema
   include     /etc/openldap/schema/nis.schema
   .
   .     
   modulepath /usr/lib/openldap/
   moduleload accesslog.la

   overlay accesslog
   logdb "cn=accesslog"
   logops writes
   logsuccess TRUE

I am getting error at overlay accesslog

  overlay "accesslog" not found
  slaptest: bad configuration file!

Am I missing something..?

Solution

I found the issue on my own. I have not compiled the openldap with --enable overlay.

To solve this issue

i have downloaded the openldap src
./configure --enable-overlays (./configure [options] [variable=value ...])
Now modify the slapd.conf to load accesslog.la and execute slaptest -f /etc/openldap/slapd.conf. Now you wont find any error.
restart the slapd.