/usr/include/KF5/messagelist/ is in libkf5messagelist-dev 4:17.12.3-0ubuntu3.
This file is owned by root:root, with mode 0o755.
..
/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