gentoo-overlay/dev-libs/libtermkey/metadata.xml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE pkgmetadata SYSTEM "https://www.gentoo.org/dtd/metadata.dtd">
<pkgmetadata>
  <maintainer type="project">
    <email>vim@gentoo.org</email>
    <name>Gentoo Vim Project</name>
  </maintainer>
  <use>
    <flag name="demos">Install demos, which pulls in <pkg>dev-libs/glib</pkg></flag>
  </use>
</pkgmetadata>