Cannot locate output from "birdc dump"

Hello, I would like to inspect BIRD's neighbor cache with "birdc dump neighbors". However, I can see no ouput. There are appearances of "<TRACE> CLI: dump neighbors" in the configured log file but no actual dumps. This is also true for "dump resources" and "dump protocols" (even though "show protocols" does list several protocols). What am I missing? This is for BIRD 2.15.1. Thanks/Děkuji, Christian