dev-libs/argtable
An ANSI C library for parsing GNU-style command-line options with minimal fuss
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doc
Global: Adds extra documentation (API, Javadoc, 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
examples
Global: Install examples, usually source code