/usr/include/viennacl/ocl/ is in libviennacl-dev 1.7.1+dfsg1-1.
This file is owned by root:root, with mode 0o755.
..
/usr/include/viennacl/ocl/backend.hpp
/usr/include/viennacl/ocl/command_queue.hpp
/usr/include/viennacl/ocl/context.hpp
/usr/include/viennacl/ocl/device.hpp
/usr/include/viennacl/ocl/device_utils.hpp
/usr/include/viennacl/ocl/enqueue.hpp
/usr/include/viennacl/ocl/error.hpp
/usr/include/viennacl/ocl/forwards.h
/usr/include/viennacl/ocl/handle.hpp
/usr/include/viennacl/ocl/kernel.hpp
/usr/include/viennacl/ocl/local_mem.hpp
/usr/include/viennacl/ocl/platform.hpp
/usr/include/viennacl/ocl/program.hpp
/usr/include/viennacl/ocl/utils.hpp