[ubuntu] Running wayland demos on Precise

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http://ubuntuforums.org – Hi, I would like to test wayland/weston demos on Precise (just for fun). I have the weston 0.95 and all it's dependencies installed from xorg-edgers ppa. Looking on the web, it mentions the wayland-demos package and the wstart command but neither seems to be available. If I run either weston or weston-start (even with sudo) from terminal, I get Code: fatal: environment variable XDG_RUNTIME_DIR is not set What shall I do? Thanks! (Hardware)