/usr/include/ is in libcgal-qt4-dev 4.2-5ubuntu1.
This file is owned by root:root, with mode 0o755.
..
/usr/include/CGAL/
/usr/include/CGAL/Qt/
/usr/include/CGAL/Qt/DemosMainWindow.h
/usr/include/CGAL/Qt/Converter.h
/usr/include/CGAL/Qt/AlphaShapeGraphicsItem.h
/usr/include/CGAL/Qt/PolygonWithHolesGraphicsItem.h
/usr/include/CGAL/Qt/PolylinesGraphicsItem.h
/usr/include/CGAL/Qt/RegularGridVectorFieldGraphicsItem.h
/usr/include/CGAL/Qt/StreamLinesGraphicsItem.h
/usr/include/CGAL/Qt/LineGraphicsItem.h
/usr/include/CGAL/Qt/PointsGraphicsItem.h
/usr/include/CGAL/Qt/GraphicsViewCircularArcInput.h
/usr/include/CGAL/Qt/PowerdiagramGraphicsItem.h
/usr/include/CGAL/Qt/RegularGridGraphicsItem.h
/usr/include/CGAL/Qt/GraphicsViewLineInput.h
/usr/include/CGAL/Qt/VoronoiGraphicsItem.h
/usr/include/CGAL/Qt/SegmentDelaunayGraphGraphicsItem.h
/usr/include/CGAL/Qt/CircularArcGraphicsItem.h
/usr/include/CGAL/Qt/PointsInKdTreeGraphicsItem.h
/usr/include/CGAL/Qt/DelaunayMeshTriangulationGraphicsItem.h
/usr/include/CGAL/Qt/GraphicsItem.h
/usr/include/CGAL/Qt/GraphicsViewPolylineInput.h
/usr/include/CGAL/Qt/RegularTriangulationGraphicsItem.h
/usr/include/CGAL/Qt/debug.h
/usr/include/CGAL/Qt/GraphicsViewCircleInput.h
/usr/include/CGAL/Qt/GraphicsViewIsoRectangleInput.h
/usr/include/CGAL/Qt/PolygonGraphicsItem.h
/usr/include/CGAL/Qt/resources.h
/usr/include/CGAL/Qt/CGAL_Qt4_config.h
/usr/include/CGAL/Qt/GraphicsViewPointInput.h
/usr/include/CGAL/Qt/GraphicsViewPolygonWithHolesInput.h
/usr/include/CGAL/Qt/SegmentsGraphicsItem.h
/usr/include/CGAL/Qt/TriangulationGraphicsItem.h
/usr/include/CGAL/Qt/GraphicsViewInput.h
/usr/include/CGAL/Qt/utility.h
/usr/include/CGAL/Qt/PainterOstream.h
/usr/include/CGAL/Qt/ApolloniusGraphGraphicsItem.h
/usr/include/CGAL/Qt/GraphicsViewNavigation.h
/usr/include/CGAL/Qt/ConstrainedTriangulationGraphicsItem.h