FreeRADIUS with Cassandra

We are trying to get FreeRADIUS 3.1 (On Ubuntu 14.04) working with a Cassandra backend but keep encountering the issue below. We have installed the Cassandra CPP driver as advised by a previous thread. "/usr/local/etc/raddb/mods-enabled/sql_cassandra[9]: Failed to link to module "rlm_cassandra": /usr/local/lib/rlm_cassandra.so: cannot open shared object file: No such file or directory : rlm_cassandra.so: cannot open shared object file: No such file or directory" Even if we manually link to or create the library file required we get unknown symbol error. Has anyone had this running with Cassandra successfully and if so any installation advice would be appreciated.