/usr/include/crystalspace-2.0/ivideo/ is in libcrystalspace-dev 2.0+dfsg-1build1.
This file is owned by root:root, with mode 0o755.
..
/usr/include/crystalspace-2.0/ivideo/cursor.h
/usr/include/crystalspace-2.0/ivideo/custcursor.h
/usr/include/crystalspace-2.0/ivideo/fontserv.h
/usr/include/crystalspace-2.0/ivideo/gfxmem.h
/usr/include/crystalspace-2.0/ivideo/graph2d.h
/usr/include/crystalspace-2.0/ivideo/graph3d.h
/usr/include/crystalspace-2.0/ivideo/halo.h
/usr/include/crystalspace-2.0/ivideo/lighting.h
/usr/include/crystalspace-2.0/ivideo/material.h
/usr/include/crystalspace-2.0/ivideo/natwin.h
/usr/include/crystalspace-2.0/ivideo/rendermesh.h
/usr/include/crystalspace-2.0/ivideo/rndbuf.h
/usr/include/crystalspace-2.0/ivideo/shader/
/usr/include/crystalspace-2.0/ivideo/shader/shader.h
/usr/include/crystalspace-2.0/ivideo/shader/xmlshader.h
/usr/include/crystalspace-2.0/ivideo/texture.h
/usr/include/crystalspace-2.0/ivideo/txtmgr.h
/usr/include/crystalspace-2.0/ivideo/wxwin.h