The OpenCL API headers in this package are unified headers and are designed to work with all released OpenCL versions. This differs from previous OpenCL API headers, where version-specific API headers either existed in separate branches, or in separate folders in a branch. By default, the OpenCL API headers in this repository are for the latest OpenCL version supported. To use these API headers to target a different OpenCL version, an application may #define the preprocessor value CL_TARGET_OPENCL_VERSION before including the OpenCL API headers. The CL_TARGET_OPENCL_VERSION is a three digit decimal value representing the OpenCL API version. KhronosGroup/OpenCL-Headers