gentoo-overlay/dev-lang/rakudo/metadata.xml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE pkgmetadata SYSTEM "http://www.gentoo.org/dtd/metadata.dtd">
<pkgmetadata>
	<herd>perl</herd>
	<maintainer>
		<email>patrick@gentoo.org</email>
		<name>Patrick Lauer</name>
	</maintainer>
        <use>
        <flag name='parrot'>Build the parrot backend (default)</flag> 
	<flag name='moar'>Build the MoarVM backend (experimental)</flag>
        </use>
</pkgmetadata>