src_prepare-overlay/dev-scheme/racket/metadata.xml

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<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE pkgmetadata SYSTEM "http://www.gentoo.org/dtd/metadata.dtd">
<pkgmetadata>
<use>
<flag name="futures">
Enable racket/future library for fine-grained hardware parallelism
</flag>
<flag name="places">
Enable racket/place library for share-nothing parallelism and message-passing communication. Compared to futures, places are heavyweight, but they have a simpler performance model.
</flag>
<flag name="threads">
Enable support for green threads
</flag>
</use>
</pkgmetadata>