/usr/include/phonenumbers/ is in libphonenumber6-dev 6.3~svn698-3+b1.
This file is owned by root:root, with mode 0o755.
..
/usr/include/phonenumbers/asyoutypeformatter.h
/usr/include/phonenumbers/base/
/usr/include/phonenumbers/base/basictypes.h
/usr/include/phonenumbers/base/memory/
/usr/include/phonenumbers/base/memory/scoped_ptr.h
/usr/include/phonenumbers/base/memory/singleton.h
/usr/include/phonenumbers/base/synchronization/
/usr/include/phonenumbers/base/synchronization/lock.h
/usr/include/phonenumbers/callback.h
/usr/include/phonenumbers/geocoding/
/usr/include/phonenumbers/geocoding/phonenumber_offline_geocoder.h
/usr/include/phonenumbers/logger.h
/usr/include/phonenumbers/phonemetadata.pb.h
/usr/include/phonenumbers/phonenumber.pb.h
/usr/include/phonenumbers/phonenumbermatch.h
/usr/include/phonenumbers/phonenumbermatcher.h
/usr/include/phonenumbers/phonenumberutil.h
/usr/include/phonenumbers/regexp_adapter.h
/usr/include/phonenumbers/regexp_cache.h
/usr/include/phonenumbers/shortnumberinfo.h
/usr/include/phonenumbers/shortnumberutil.h
/usr/include/phonenumbers/unicodestring.h
/usr/include/phonenumbers/utf/
/usr/include/phonenumbers/utf/unicodetext.h