app-misc/usbeehive
Tells you what each USB cable / device on Linux can actually do. Rust port of WhatCable; previously published as `whatcable`.
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dbus
Global: Enable dbus support for anything that needs it (gpsd, gnomemeeting, etc)
debug
Global: Enable extra debug codepaths, like asserts and extra output. If you want to get meaningful backtraces see http://www.gentoo.org/proj/en/qa/backtraces.xml