gentoo-overlay/app-arch/pbzip2/metadata.xml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE pkgmetadata SYSTEM "https://www.gentoo.org/dtd/metadata.dtd">
<pkgmetadata>
	<!-- maintainer-needed -->
	<use>
		<flag name="symlink">Install symlinks which override <pkg>app-arch/bzip2</pkg> implementation</flag>
	</use>
	<upstream>
		<remote-id type="launchpad">pbzip2</remote-id>
	</upstream>
</pkgmetadata>