/usr/include/ is in libkf5messagelist-dev 4:17.12.3-0ubuntu3.
This file is owned by root:root, with mode 0o755.
..
/usr/include/KF5/messagelist/
/usr/include/KF5/
/usr/include/KF5/MessageList/
/usr/include/KF5/MessageList/AggregationComboBox
/usr/include/KF5/MessageList/AggregationConfigButton
/usr/include/KF5/MessageList/Enums
/usr/include/KF5/MessageList/MessageListUtil
/usr/include/KF5/MessageList/Pane
/usr/include/KF5/MessageList/QuickSearchLine
/usr/include/KF5/MessageList/StorageModel
/usr/include/KF5/MessageList/StorageModelBase
/usr/include/KF5/MessageList/ThemeComboBox
/usr/include/KF5/MessageList/ThemeConfigButton
/usr/include/KF5/MessageList/View
/usr/include/KF5/MessageList/WidgetBase
/usr/include/KF5/messagelist/aggregationcombobox.h
/usr/include/KF5/messagelist/aggregationconfigbutton.h
/usr/include/KF5/messagelist/enums.h
/usr/include/KF5/messagelist/messagelist_export.h
/usr/include/KF5/messagelist/messagelistsettings.h
/usr/include/KF5/messagelist/messagelistutil.h
/usr/include/KF5/messagelist/pane.h
/usr/include/KF5/messagelist/quicksearchline.h
/usr/include/KF5/messagelist/storagemodel.h
/usr/include/KF5/messagelist/storagemodelbase.h
/usr/include/KF5/messagelist/themecombobox.h
/usr/include/KF5/messagelist/themeconfigbutton.h
/usr/include/KF5/messagelist/view.h
/usr/include/KF5/messagelist/widgetbase.h
/usr/include/KF5/messagelist_version.h