* librrd (optional; headers and library; rrdtool 1.0 and 1.2 both work fine)
If built without `librrd' the resulting binary will be `client only', i.e.
- will send it's values via multicast and not create any RRD files itself.
+ will send its values via multicast and not create any RRD files itself.
Alternatively you can chose to write CSV-files (Comma Seperated Values)
instead.