gentoo-overlay/net-misc/spice-gtk/metadata.xml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE pkgmetadata SYSTEM "http://www.gentoo.org/dtd/metadata.dtd">
<pkgmetadata>
  <herd>virtualization</herd>
  <maintainer>
    <email>dev-zero@gentoo.org</email>
    <name>Tiziano Müller</name>
  </maintainer>
  <use>
    <flag name="gtk3">Link against <pkg>x11-libs/gtk+:3</pkg> instead of
			<pkg>x11-libs/gtk+:2</pkg></flag>
    <flag name="policykit">Enable <pkg>sys-auth/polkit</pkg> support for the
			usbredir acl helper</flag>
    <flag name="usbredir">Use <pkg>sys-apps/usbredir</pkg> to redirect USB
			devices to another machine over TCP</flag>
    <flag name="vala">Generate <pkg>dev-lang/vala</pkg> bindings using
			vapigen and regenerate .vala files using valac</flag>
    <flag name="dbus">Support for desktop integration such as
			automounting and other APIs exposed by your DE via D-Bus</flag>
    <flag name="webdav">Support for folder-sharing between guest and client
		using <pkg>net-libs/phodav</pkg></flag>
  </use>
</pkgmetadata>