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freeradius-server-2.1.6 is installed without warning on CentOS v5.3 ...configured on localhost and tested. Everything's OK.
For the authentication I d like to use openldap which is already ready. I tested it and it work(on ldap.uae.ac.ma: you can check it).
I installed my freeradius in /usr/local/freeradius-server-2.1.6...So I edit  the following files:
ldap in /usr/local/freeradius-server.2.16/etc/raddb/modules/ldap
raidusd.conf in /usr/local/freeradius-server-2.1.6/etc/radiusd.conf
default in /usr/local/freeradius-server-2.1.6/etc/raddb/sites-enabled/default
to have the appropriate configuration ...

When I execute /usr/local/freeradius-server-2.1.6/sbin/radiusd -XXX to start(in debug mode) the server it gives the following error:
failed to link to module 'rlm_ldap':rlm_ldap.so:cannot open shared object file :No such file or directory

there are another errors after it but, if this one is solved so ...everything ll be ok.
I am bored and I don't know what to do: I found in another topic that I'll have to rebuild and re-install my server ...Is that true?Is there another solution?
thx.