/usr/include/KF5/LibkdepimAkonadi/ is in libkf5libkdepim-dev 4:17.12.3-0ubuntu1.
This file is owned by root:root, with mode 0o755.
..
/usr/include/KF5/LibkdepimAkonadi/AddContactJob
/usr/include/KF5/LibkdepimAkonadi/AddEmailAddressJob
/usr/include/KF5/LibkdepimAkonadi/AddEmailDisplayJob
/usr/include/KF5/LibkdepimAkonadi/AddresseeLineEdit
/usr/include/KF5/LibkdepimAkonadi/CollectionSearchJob
/usr/include/KF5/LibkdepimAkonadi/CompletionConfigureDialog
/usr/include/KF5/LibkdepimAkonadi/CompletionOrderEditor
/usr/include/KF5/LibkdepimAkonadi/OpenEmailAddressJob
/usr/include/KF5/LibkdepimAkonadi/Person
/usr/include/KF5/LibkdepimAkonadi/PersonSearchJob
/usr/include/KF5/LibkdepimAkonadi/ProgressManagerAkonadi
/usr/include/KF5/LibkdepimAkonadi/TagSelectionCombo
/usr/include/KF5/LibkdepimAkonadi/TagWidgets