gentoo-overlay/media-libs/libextractor/metadata.xml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE pkgmetadata SYSTEM "http://www.gentoo.org/dtd/metadata.dtd">
<pkgmetadata>
  <!--maintainer-needed-->
  <use>
    <flag name="apparmor">Enable apparmor support using <pkg>sys-libs/libapparmor</pkg></flag>
    <flag name="archive">Enable archive support using <pkg>app-arch/libarchive</pkg></flag>
    <flag name="gsf">Enable OLE2 (MS Office) plug-in support using <pkg>gnome-extra/libgsf</pkg></flag>
    <flag name="midi">Enable MIDI support through <pkg>media-libs/libsmf</pkg></flag>
  </use>
</pkgmetadata>