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In systems with more then one graphics card the rendernode is currently picked based on the order in which they are listed in /dev/dri. Add an command line option and a environment variable to make it possible to specify the render node explicitely. Fixes #135 Signed-off-by: Gert Wollny <gert.wollny@collabora.com> Reviewed-by: Emil Velikov <emil.velikov@collabora.com>
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