/usr/include/OpenImageIO/ is in libopenimageio-dev 1.6.11~dfsg0-1ubuntu1.
This file is owned by root:root, with mode 0o755.
..
/usr/include/OpenImageIO/SHA1.h
/usr/include/OpenImageIO/argparse.h
/usr/include/OpenImageIO/array_view.h
/usr/include/OpenImageIO/color.h
/usr/include/OpenImageIO/coordinate.h
/usr/include/OpenImageIO/dassert.h
/usr/include/OpenImageIO/errorhandler.h
/usr/include/OpenImageIO/export.h
/usr/include/OpenImageIO/filesystem.h
/usr/include/OpenImageIO/filter.h
/usr/include/OpenImageIO/fmath.h
/usr/include/OpenImageIO/fstream_mingw.h
/usr/include/OpenImageIO/hash.h
/usr/include/OpenImageIO/image_view.h
/usr/include/OpenImageIO/imagebuf.h
/usr/include/OpenImageIO/imagebufalgo.h
/usr/include/OpenImageIO/imagebufalgo_util.h
/usr/include/OpenImageIO/imagecache.h
/usr/include/OpenImageIO/imageio.h
/usr/include/OpenImageIO/missing_math.h
/usr/include/OpenImageIO/oiioversion.h
/usr/include/OpenImageIO/optparser.h
/usr/include/OpenImageIO/osdep.h
/usr/include/OpenImageIO/paramlist.h
/usr/include/OpenImageIO/platform.h
/usr/include/OpenImageIO/plugin.h
/usr/include/OpenImageIO/pugiconfig.hpp
/usr/include/OpenImageIO/pugixml.cpp
/usr/include/OpenImageIO/pugixml.hpp
/usr/include/OpenImageIO/refcnt.h
/usr/include/OpenImageIO/simd.h
/usr/include/OpenImageIO/strided_ptr.h
/usr/include/OpenImageIO/string_view.h
/usr/include/OpenImageIO/strutil.h
/usr/include/OpenImageIO/sysutil.h
/usr/include/OpenImageIO/texture.h
/usr/include/OpenImageIO/thread.h
/usr/include/OpenImageIO/timer.h
/usr/include/OpenImageIO/tinyformat.h
/usr/include/OpenImageIO/typedesc.h
/usr/include/OpenImageIO/unittest.h
/usr/include/OpenImageIO/unordered_map_concurrent.h
/usr/include/OpenImageIO/ustring.h
/usr/include/OpenImageIO/varyingref.h
/usr/include/OpenImageIO/version.h