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When kwsys is built using GCC visibility support can be used. This is similar to the way that Windows exports symbols in DLLs, and requires projects that build kwsys to change the default visibility using some compiler flags. See http://gcc.gnu.org/wiki/Visibility for more details about GCC visibility.
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.