gentoo-overlay/app-office/libreoffice/metadata.xml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE pkgmetadata SYSTEM "http://www.gentoo.org/dtd/metadata.dtd">
<pkgmetadata>
  <herd>openoffice</herd>
  <longdescription>LibreOffice is a fork of OpenOffice.org. 
This ebuild allows you to compile it yourself. Unfortunately this 
compilation can take up to a day depending on the speed of your 
computer. It will however make a snappier openoffice than the binary 
version</longdescription>
  <use>
    <flag name="gtk3">Enable highly experimental gtk3 frontend</flag>
    <flag name="jemalloc">Use <pkg>dev-libs/jemalloc</pkg> for allocations</flag>
    <flag name="odk">Build the Office Development Kit</flag>
    <flag name="telepathy">Enable document colaboration features using telepathy communication framework.</flag>
    <flag name="vba">Enable support for VBA compatibility and ActiveX embedding</flag>
	<flag name="vlc">Use <pkg>media-video/vlc</pkg> for video embedding</flag>
    <flag name="webdav">Adds support for HTTP content adding via <pkg>net-libs/neon</pkg></flag>
  </use>
</pkgmetadata>