/usr/include/ignition/fuel_tools1/ is in libignition-fuel-tools1-dev 1.0.0+dfsg4-4.
This file is owned by root:root, with mode 0o755.
..
/usr/include/ignition/fuel_tools1/ignition/
/usr/include/ignition/fuel_tools1/ignition/fuel_tools/
/usr/include/ignition/fuel_tools1/ignition/fuel_tools.hh
/usr/include/ignition/fuel_tools1/ignition/fuel_tools/ClientConfig.hh
/usr/include/ignition/fuel_tools1/ignition/fuel_tools/Export.hh
/usr/include/ignition/fuel_tools1/ignition/fuel_tools/FuelClient.hh
/usr/include/ignition/fuel_tools1/ignition/fuel_tools/Helpers.hh
/usr/include/ignition/fuel_tools1/ignition/fuel_tools/JSONParser.hh
/usr/include/ignition/fuel_tools1/ignition/fuel_tools/LocalCache.hh
/usr/include/ignition/fuel_tools1/ignition/fuel_tools/Model.hh
/usr/include/ignition/fuel_tools1/ignition/fuel_tools/ModelIdentifier.hh
/usr/include/ignition/fuel_tools1/ignition/fuel_tools/ModelIter.hh
/usr/include/ignition/fuel_tools1/ignition/fuel_tools/ModelIterPrivate.hh
/usr/include/ignition/fuel_tools1/ignition/fuel_tools/ModelPrivate.hh
/usr/include/ignition/fuel_tools1/ignition/fuel_tools/REST.hh
/usr/include/ignition/fuel_tools1/ignition/fuel_tools/Result.hh
/usr/include/ignition/fuel_tools1/ignition/fuel_tools/Zip.hh
/usr/include/ignition/fuel_tools1/ignition/fuel_tools/config.hh
/usr/include/ignition/fuel_tools1/ignition/fuel_tools/detail/
/usr/include/ignition/fuel_tools1/ignition/fuel_tools/detail/Export.hh