gentoo-overlay/app-emulation/qemu-kvm/metadata.xml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE pkgmetadata SYSTEM "http://www.gentoo.org/dtd/metadata.dtd">
<pkgmetadata>
  <herd>qemu</herd>
  <use>
    <flag name='aio'>Enables support for Linux's Async IO</flag>
    <flag name='alsa'>Enable alsa output for sound emulation</flag>
    <flag name='brltty'>Adds support for braille displays using brltty</flag>
    <flag name='esd'>Enable esound output for sound emulation</flag>
    <flag name='fdt'>Enables firmware device tree support</flag>
    <flag name='jpeg'>Enable JPEG compression for the VNC console server</flag>
    <flag name='ncurses'>Enable the ncurses-based console</flag>
    <flag name='nss'>Build support for Smartcard devices emulation using <pkg>dev-libs/nss</pkg></flag>
    <flag name='png'>Enable PNG compression for the VNC console server</flag>
    <flag name='pulseaudio'>Enable pulseaudio output for sound emulation</flag>
    <flag name='qemu-ifup'>Provides the qemu-ifup script for use with QEMU's
		built in bridging</flag>
    <flag name='rbd'>Enable rados block device backend support, see http://ceph.newdream.net/wiki/QEMU-RBD</flag>
    <flag name='sdl'>Enable the SDL-based console</flag>
    <flag name='spice'>Enable Spice protocol support via <pkg>app-emulation/spice</pkg></flag>
    <flag name='ssl'>Enable TLS support for the VNC console server</flag>
    <flag name='tls'>Enable TLS support for the VNC console server</flag>
    <flag name="usbredir">Use <pkg>sys-apps/usbredir</pkg> to redirect USB
        devices to another machine over TCP</flag>
    <flag name='vde'>Enable VDE-based networking</flag>
    <flag name='vhost-net'>Enable accelerated networking using vhost-net, see http://www.linux-kvm.org/page/VhostNet</flag>
    <flag name='xattr'>
      Add support for getting and setting POSIX extended attributes, through
      <pkg>sys-apps/attr</pkg>. Requisite for the virtfs backend.
    </flag>
    <flag name='xen'>Enables support for Xen backends</flag>
  </use>
</pkgmetadata>