Could not find plugin write_http in /usr/lib64/collectd

Following the instructions from http://docs.splunk.com/Documentation/AddOns/released/Linux/Configure, I set up my config by uncommenting the `LoadPlugin write_http`, and creating my Node: <Plugin write_http> <Node burch> URL https://<myhost>:8088/services/collector/raw?channel=<mytoken> He</mytoken></myhost></node></plugin>…