/usr/include/kadu/plugins/history/ is in kadu-dev 4.1-1.1.
This file is owned by root:root, with mode 0o755.
..
/usr/include/kadu/plugins/history/actions/
/usr/include/kadu/plugins/history/actions/show-history-action-description.h
/usr/include/kadu/plugins/history/buddy-history-delete-handler.h
/usr/include/kadu/plugins/history/chats-buddies-splitter.h
/usr/include/kadu/plugins/history/gui/
/usr/include/kadu/plugins/history/gui/widgets/
/usr/include/kadu/plugins/history/gui/widgets/chat-history-tab.h
/usr/include/kadu/plugins/history/gui/widgets/history-buddy-configuration-widget-factory.h
/usr/include/kadu/plugins/history/gui/widgets/history-buddy-configuration-widget.h
/usr/include/kadu/plugins/history/gui/widgets/history-chat-configuration-widget-factory.h
/usr/include/kadu/plugins/history/gui/widgets/history-chat-configuration-widget.h
/usr/include/kadu/plugins/history/gui/widgets/history-messages-tab.h
/usr/include/kadu/plugins/history/gui/widgets/history-tab.h
/usr/include/kadu/plugins/history/gui/widgets/history-talkable-combo-box.h
/usr/include/kadu/plugins/history/gui/widgets/search-tab.h
/usr/include/kadu/plugins/history/gui/widgets/timeline-chat-messages-view.h
/usr/include/kadu/plugins/history/gui/windows/
/usr/include/kadu/plugins/history/gui/windows/history-window-service.h
/usr/include/kadu/plugins/history/gui/windows/history-window.h
/usr/include/kadu/plugins/history/history-exports.h
/usr/include/kadu/plugins/history/history-messages-prepender.h
/usr/include/kadu/plugins/history/history-module.h
/usr/include/kadu/plugins/history/history-plugin-modules-factory.h
/usr/include/kadu/plugins/history/history-plugin-object.h
/usr/include/kadu/plugins/history/history-query-result.h
/usr/include/kadu/plugins/history/history-query.h
/usr/include/kadu/plugins/history/history-save-thread.h
/usr/include/kadu/plugins/history/history.h
/usr/include/kadu/plugins/history/model/
/usr/include/kadu/plugins/history/model/history-query-results-model.h
/usr/include/kadu/plugins/history/model/history-query-results-proxy-model.h
/usr/include/kadu/plugins/history/search/
/usr/include/kadu/plugins/history/search/history-search-parameters.h
/usr/include/kadu/plugins/history/storage/
/usr/include/kadu/plugins/history/storage/history-messages-storage.h
/usr/include/kadu/plugins/history/storage/history-storage.h