sci-electronics/geda
Core metapackage for all the necessary components you would need for a minimal gEDA/gaf system
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doc
Global: Adds extra documentation (API, Javadoc, etc)
examples
Global: Install examples, usually source code
gd
Global: Adds support for media-libs/gd (to generate graphics on the fly)
threads
Global: Adds threads support for various packages. Usually pthreads