gentoo-overlay/virtual/mysql/metadata.xml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE pkgmetadata SYSTEM "http://www.gentoo.org/dtd/metadata.dtd">
<pkgmetadata>
  <maintainer type="project">
    <email>mysql-bugs@gentoo.org</email>
    <name>MySQL</name>
  </maintainer>
  <use>
    <flag name="embedded">Build embedded server (libmysqld)</flag>
    <flag name="server">Build server (mysqld)</flag>
  </use>
</pkgmetadata>