freeradius and ldap

[Eric]

Hi,
I installed freeradius-server-2.1.6. It is related with a LDAP server.when
run radiusd -X
there is this error:
/usr/local/etc/raddb/modules/ldap[29]: Failed to link to module 'rlm_ldap':
/usr/lib/rlm_ldap.so: undefined symbol: librad_errstr

Is it needed to install freeradius-ldap or my config may have error?
I downloded  freeradius-ldap-2.1.3-1.fc10.i386.rpm. when I want to install
it needs
libldap_r-2.4.so.2. and searching this file gives openldap that its
installing needs dependencies
too.
What is my mistake?
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