/usr/include/osgEarthQt/ is in libosgearth-dev 2.5.0+dfsg-2+b2.
This file is owned by root:root, with mode 0o755.
..
/usr/include/osgEarthQt/Actions
/usr/include/osgEarthQt/AnnotationDialogs
/usr/include/osgEarthQt/AnnotationListWidget
/usr/include/osgEarthQt/AnnotationToolbar
/usr/include/osgEarthQt/CollapsiblePairWidget
/usr/include/osgEarthQt/Common
/usr/include/osgEarthQt/DataManager
/usr/include/osgEarthQt/GuiActions
/usr/include/osgEarthQt/LOSControlWidget
/usr/include/osgEarthQt/LOSCreationDialog
/usr/include/osgEarthQt/LOSCreationDialog.ui
/usr/include/osgEarthQt/LayerManagerWidget
/usr/include/osgEarthQt/MapCatalogWidget
/usr/include/osgEarthQt/TerrainProfileGraph
/usr/include/osgEarthQt/TerrainProfileWidget
/usr/include/osgEarthQt/ViewWidget
/usr/include/osgEarthQt/ViewerWidget
/usr/include/osgEarthQt/images.qrc
/usr/include/osgEarthQt/ui_LOSCreationDialog.h