/usr/include/osgManipulator/ is in libopenscenegraph-dev 3.2.1-6.
This file is owned by root:root, with mode 0o755.
..
/usr/include/osgManipulator/AntiSquish
/usr/include/osgManipulator/Command
/usr/include/osgManipulator/CommandManager
/usr/include/osgManipulator/Constraint
/usr/include/osgManipulator/Dragger
/usr/include/osgManipulator/Export
/usr/include/osgManipulator/Projector
/usr/include/osgManipulator/RotateCylinderDragger
/usr/include/osgManipulator/RotateSphereDragger
/usr/include/osgManipulator/Scale1DDragger
/usr/include/osgManipulator/Scale2DDragger
/usr/include/osgManipulator/ScaleAxisDragger
/usr/include/osgManipulator/Selection
/usr/include/osgManipulator/TabBoxDragger
/usr/include/osgManipulator/TabBoxTrackballDragger
/usr/include/osgManipulator/TabPlaneDragger
/usr/include/osgManipulator/TabPlaneTrackballDragger
/usr/include/osgManipulator/TrackballDragger
/usr/include/osgManipulator/Translate1DDragger
/usr/include/osgManipulator/Translate2DDragger
/usr/include/osgManipulator/TranslateAxisDragger
/usr/include/osgManipulator/TranslatePlaneDragger
/usr/include/osgManipulator/Version