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- This will help projects support multiple CMake versions. - In order to set a policy when using a newer CMake but still working with an older CMake one may write if(POLICY CMP1234) cmake_policy(SET CMP1234 NEW) endif(POLICY CMP1234) - Note that since CMake 2.4 does not have if(POLICY) supporting it will also require using "if(COMMAND cmake_policy)"