gentoo-overlay/gnome-base/gnome-settings-daemon/metadata.xml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE pkgmetadata SYSTEM "https://www.gentoo.org/dtd/metadata.dtd">
<pkgmetadata>
  <maintainer type="project">
    <email>gnome@gentoo.org</email>
    <name>Gentoo GNOME Desktop</name>
  </maintainer>
  <use>
    <flag name="elogind">Rely on <pkg>sys-auth/elogind</pkg> as runtime logind provider</flag>
    <flag name="modemmanager">Enable WWAN support via <pkg>net-misc/modemmanager</pkg></flag>
    <flag name="systemd">Rely on <pkg>sys-apps/systemd</pkg> as runtime logind provider</flag>
  </use>
  <upstream>
    <remote-id type="gnome-gitlab">GNOME/gnome-settings-daemon</remote-id>
  </upstream>
</pkgmetadata>