/usr/include/Inventor/manips/ is in libcoin80-dev 3.1.4~abc9f50+dfsg1-2.
This file is owned by root:root, with mode 0o755.
..
/usr/include/Inventor/manips/SoCenterballManip.h
/usr/include/Inventor/manips/SoClipPlaneManip.h
/usr/include/Inventor/manips/SoDirectionalLightManip.h
/usr/include/Inventor/manips/SoHandleBoxManip.h
/usr/include/Inventor/manips/SoJackManip.h
/usr/include/Inventor/manips/SoPointLightManip.h
/usr/include/Inventor/manips/SoSpotLightManip.h
/usr/include/Inventor/manips/SoTabBoxManip.h
/usr/include/Inventor/manips/SoTrackballManip.h
/usr/include/Inventor/manips/SoTransformBoxManip.h
/usr/include/Inventor/manips/SoTransformManip.h
/usr/include/Inventor/manips/SoTransformerManip.h