sci-chemistry/eden/metadata.xml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE pkgmetadata SYSTEM "http://www.gentoo.org/dtd/metadata.dtd">
<pkgmetadata>
  <maintainer type="project">
    <email>sci-chemistry@gentoo.org</email>
    <name>Gentoo Chemistry Project</name>
  </maintainer>
  <use>
    <flag name="double-precision">More precise calculations at the expense of
    speed</flag>
  </use>
</pkgmetadata>