Could not link driver rlm_sql_oracle: libclntsh.so.10.1

hello, i've got Linux 2.6.9-22 and freeRADIUS server v.2.1.1. after installing and configured FreeRADIUS i try to to start the daemon with -X parametr and get the error: Could not link driver rlm_sql_oracle: libclntsh.so.10.1: cannot open shared object file: No such file or directory Make sure it (and all its dependent libraries!) are in the search path of your system's ld. /usr/local/etc/raddb/sql.conf[22]: Instantiation failed for module "sql" /usr/local/etc/raddb/sites-enabled/default[152]: Failed to find module "sql". /usr/local/etc/raddb/sites-enabled/default[62]: Errors parsing authorize section can anyone please help to solve this problem or push me to the right way? thanks in advance ilya