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Increasingly, software needs to dynamically adapt its behavior at run-time in response to changing conditions in the supporting computing infrastructure and in the surrounding physical environment. This paper introduces an approach for the design of pervasive SPLs that is based on model driven development (MDD) and Variability Modeling principles. Variability models are interpreted at run-time to reconfigure pervasive systems according to fluctuations in the environment. This approach helps to improve Pervasive SPLs to produce software that adapts itself in an autonomic way. We have developed an adaptive pervasive system for smart homes to validate this approach.