games-util/ucon64
The backup tool and wonderful emulator's Swiss Army knife program
USE Flags
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
usb
Global: Adds USB support to applications that have optional USB support (e.g. cups)
zlib
Global: Adds support for zlib (de)compression