Still + 1

The latest Wheezy update as of this writing still contains a buggy Xephyr, version xorg-server-1.12.4. The patch

http://patchwork.freedesktop.org/patch/12146/

still needs to be applied. But Xephyr needs to be recompiled with -enable-kdrive-evdev anyway for our purposes, so applying this one-liner won't hurt. Other than that, it works fine.