/usr/include/GNUstep/Addresses is in libaddresses-dev 0.4.7-1+b5.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/include/GNUstep/../../lib/GNUstep/Frameworks/Addresses.framework/Headers
/usr/include/GNUstep/../../lib/GNUstep/Frameworks/Addresses.framework/Headers