dev-java/antlr
A parser generator for many languages
USE Flags
doc
Global: Adds extra documentation (API, Javadoc, etc)
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
examples
Global: Install examples, usually source code
source
Global: Zip the sources and install them