freeradius and ldap

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?