/usr/include/Inventor/misc/ is in inventor-dev 2.1.5-10-16ubuntu1.
This file is owned by root:root, with mode 0o755.
..
/usr/include/Inventor/misc/SoAuditorList.h
/usr/include/Inventor/misc/SoBase.h
/usr/include/Inventor/misc/SoBasic.h
/usr/include/Inventor/misc/SoByteStream.h
/usr/include/Inventor/misc/SoCallbackList.h
/usr/include/Inventor/misc/SoChildList.h
/usr/include/Inventor/misc/SoCompactPathList.h
/usr/include/Inventor/misc/SoNormalGenerator.h
/usr/include/Inventor/misc/SoNotification.h
/usr/include/Inventor/misc/SoState.h
/usr/include/Inventor/misc/SoTempPath.h
/usr/include/Inventor/misc/SoTranscribe.h
/usr/include/Inventor/misc/upgraders/
/usr/include/Inventor/misc/upgraders/SoUpgrader.h
/usr/include/Inventor/misc/upgraders/SoV1AppearanceKit.h
/usr/include/Inventor/misc/upgraders/SoV1BaseKit.h
/usr/include/Inventor/misc/upgraders/SoV1CameraKit.h
/usr/include/Inventor/misc/upgraders/SoV1ConeKit.h
/usr/include/Inventor/misc/upgraders/SoV1CubeKit.h
/usr/include/Inventor/misc/upgraders/SoV1CustomNode.h
/usr/include/Inventor/misc/upgraders/SoV1CylinderKit.h
/usr/include/Inventor/misc/upgraders/SoV1DirectionalLightKit.h
/usr/include/Inventor/misc/upgraders/SoV1FaceSetKit.h
/usr/include/Inventor/misc/upgraders/SoV1GroupKit.h
/usr/include/Inventor/misc/upgraders/SoV1IndexedFaceSetKit.h
/usr/include/Inventor/misc/upgraders/SoV1IndexedLineSetKit.h
/usr/include/Inventor/misc/upgraders/SoV1IndexedNurbsCurveKit.h
/usr/include/Inventor/misc/upgraders/SoV1IndexedNurbsSurfaceKit.h
/usr/include/Inventor/misc/upgraders/SoV1IndexedTriangleMeshKit.h
/usr/include/Inventor/misc/upgraders/SoV1LightKit.h
/usr/include/Inventor/misc/upgraders/SoV1LineSetKit.h
/usr/include/Inventor/misc/upgraders/SoV1NodeKit.h
/usr/include/Inventor/misc/upgraders/SoV1NodekitCatalog.h
/usr/include/Inventor/misc/upgraders/SoV1NodekitParts.h
/usr/include/Inventor/misc/upgraders/SoV1NurbsCurveKit.h
/usr/include/Inventor/misc/upgraders/SoV1NurbsSurfaceKit.h
/usr/include/Inventor/misc/upgraders/SoV1OrthographicCameraKit.h
/usr/include/Inventor/misc/upgraders/SoV1PerspectiveCameraKit.h
/usr/include/Inventor/misc/upgraders/SoV1PointLightKit.h
/usr/include/Inventor/misc/upgraders/SoV1PointSetKit.h
/usr/include/Inventor/misc/upgraders/SoV1QuadMeshKit.h
/usr/include/Inventor/misc/upgraders/SoV1SceneKit.h
/usr/include/Inventor/misc/upgraders/SoV1ShapeKit.h
/usr/include/Inventor/misc/upgraders/SoV1SphereKit.h
/usr/include/Inventor/misc/upgraders/SoV1SpotLightKit.h
/usr/include/Inventor/misc/upgraders/SoV1SubKit.h
/usr/include/Inventor/misc/upgraders/SoV1Text2Kit.h
/usr/include/Inventor/misc/upgraders/SoV1Text3Kit.h
/usr/include/Inventor/misc/upgraders/SoV1TriangleStripSetKit.h
/usr/include/Inventor/misc/upgraders/SoV1VertexShapeKit.h
/usr/include/Inventor/misc/upgraders/SoV1WrapperKit.h