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wlroots reads these environment variables
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wlroots specific
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----------------
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* *WLR_DRM_DEVICES*: specifies the DRM devices (as a colon separated list)
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instead of auto probing them. The first existing device in this list is
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considered the primary DRM device.
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* *WLR_DRM_NO_ATOMIC*: set to 1 to use legacy DRM interface instead of atomic
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mode setting
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* *WLR_LIBINPUT_NO_DEVICES*: set to 1 to not fail without any input devices
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* *WLR_BACKENDS*: comma-separated list of backends to use (available backends:
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wayland, x11, headless)
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* *WLR_WL_OUTPUTS*: when using the wayland backend specifies the number of outputs
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* *WLR_X11_OUTPUTS*: when using the X11 backend specifies the number of outputs
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rootston specific
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* *XKB_DEFAULT_RULES*, *XKB_DEFAULT_MODEL*, *XKB_DEFAULT_LAYOUT*,
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*XKB_DEFAULT_VARIANT*, *XKB_DEFAULT_OPTIONS*: xkb setup
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generic
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-------
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* *DISPLAY*: if set probe X11 backend in *wlr_backend_autocreate*
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* *WAYLAND_DISPLAY*, *_WAYLAND_DISPLAY*, *WAYLAND_SOCKET*: if set probe Wayland
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backend in *wlr_backend_autocreate*
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* *XCURSOR_PATH*: directory where xcursors are located
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* *XDG_RUNTIME_DIR*: used to store non persistent temporary files
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