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# the Free Software Foundation; either version 2 of the License, or
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# (at your option) any later version.
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# Check for environment variables
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if [ -z "$HAL_PROP_LAPTOP_PANEL_ACCESS_METHOD" -a -z "$HAL_PROP_LINUX_SYSFS_PATH" ] ||
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[ -z "$HAL_PROP_LAPTOP_PANEL_NUM_LEVELS" ] ; then