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

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE pkgmetadata SYSTEM "http://www.gentoo.org/dtd/metadata.dtd">
<pkgmetadata>
<herd>deb-tools</herd>
<use>
<flag name="dselect">Build the dselect package-management frontend</flag>
<flag name="update-alternatives">Install update-alternatives</flag>
</use>
</pkgmetadata>