media-video/mkvtoolnix
Tools to create, alter, and inspect Matroska files
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
dvd
Global: Adds support for DVDs
gui
Global: Build some GUI components (inside the guest window).
nls
Global: Adds Native Language Support (using gettext - GNU locale utilities)
pch
Global: Enable precompiled header support for faster compilation at the expense of disk space and memory (>=sys-devel/gcc-3.4 only)
test
Global: Workaround to pull in packages needed to run with FEATURES=test. Portage-2.1.2 handles this internally, so don't set it in make.conf/package.use anymore
verify-sig
* This flag is undocumented *