gentoo-overlay/dev-php/pecl-mysqlnd_qc/metadata.xml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE pkgmetadata SYSTEM "http://www.gentoo.org/dtd/metadata.dtd">
<pkgmetadata>
  <maintainer type="project">
    <email>php-bugs@gentoo.org</email>
    <name>PHP</name>
  </maintainer>
  <use>
    <flag name="memcached">Use <pkg>dev-libs/libmemcached</pkg> as a storage handler</flag>
    <flag name="sqlite">Use <pkg>dev-db/sqlite</pkg> as a storage handler</flag>
  </use>
</pkgmetadata>