Version 1.7.5 is available upstream. Please consider updating! It seems that version 1.7.5 is available upstream, while the latest version in the Gentoo tree is 1.7.4. You think this warning is false? Read more about it here.
nfdump is a toolset to collect and process netflow and sflow
data, sent from netflow/sflow compatible devices. The toolset supports
netflow v1, v5/v7,v9,IPFIX and SFLOW.