gentoo-overlay/app-crypt/truecrypt/metadata.xml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE pkgmetadata SYSTEM "http://www.gentoo.org/dtd/metadata.dtd">
<pkgmetadata>
	<herd>crypto</herd>
	<use>
		<flag name="asm">Enable assembly for optimization</flag>
	</use>
	<upstream>
		<remote-id type="sourceforge">truecrypt</remote-id>
	</upstream>
</pkgmetadata>