gentoo-overlay/dev-haskell/semigroupoid-extras/metadata.xml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE pkgmetadata SYSTEM "http://www.gentoo.org/dtd/metadata.dtd">
<pkgmetadata>
	<maintainer type="project">
		<email>haskell@gentoo.org</email>
		<name>Gentoo Haskell</name>
	</maintainer>
	<use>
		<flag name="profunctors">
			You can disable the use of the
			`profunctors` package using `-f-profunctors`. Disabing this is
			an unsupported configuration, but it may be useful for
			accelerating builds in sandboxes for expert users.
		</flag>
	</use>
</pkgmetadata>