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CMake is aware of the policy's NEW behavior and the AppleClang compiler id. Set the policy to NEW explicitly to avoid the warning and get the NEW behavior. Also teach the RunCMake test infrastructure to build tests with -DCMAKE_POLICY_DEFAULT_CMP0025=NEW to avoid the policy warning in test output that must match specific regular expressions.
KWSys provides a platform-independent API to many common system features that are implemented differently on every platform. This library is intended to be shared among many projects, so it has a configurable namespace. Each project should configure KWSys to use a namespace unique to itself. See comments in CMakeLists.txt for details. You are probably reading this file in the source tree of a surrounding project. In that case, see "../README.kwsys" for details of using KWSys in your project.