add_subdirectory( cl_ext_cxx_for_opencl )
add_subdirectory( cl_khr_command_buffer )
add_subdirectory( cl_khr_dx9_media_sharing )
add_subdirectory( cl_khr_semaphore )
if(VULKAN_IS_SUPPORTED)
    add_subdirectory( cl_khr_external_semaphore )
endif()