/usr/include/KF5/ is in libkf5auth-dev 5.44.0-0ubuntu1.
This file is owned by root:root, with mode 0o755.
..
/usr/include/KF5/KAuth/
/usr/include/KF5/KAuth/KAuth
/usr/include/KF5/KAuth/KAuthAction
/usr/include/KF5/KAuth/KAuthActionReply
/usr/include/KF5/KAuth/KAuthExecuteJob
/usr/include/KF5/KAuth/KAuthHelperSupport
/usr/include/KF5/KAuth/KAuthObjectDecorator
/usr/include/KF5/KAuth/kauth.h
/usr/include/KF5/KAuth/kauth_export.h
/usr/include/KF5/KAuth/kauthaction.h
/usr/include/KF5/KAuth/kauthactionreply.h
/usr/include/KF5/KAuth/kauthexecutejob.h
/usr/include/KF5/KAuth/kauthhelpersupport.h
/usr/include/KF5/KAuth/kauthobjectdecorator.h
/usr/include/KF5/kauth_version.h