It's a CLI tool to dump tcp streams. Pulling in cairo, boost, etc just for a feature pretty much nobody uses (apparently it can create a PDF summary) AND not being able to disable this using a USE flag (which, in my opinion, should be disabled by default) is quite annoying. Apparently Ubuntu has a separate version of tcpflow that doesn't depend on graphics-related libraries: http://packages.ubuntu.com/vivid/tcpflow-nox Would be nice if Gentoo hat such a package, too - or simply a USE flag.
