/usr/include/Inventor/nodekits/ is in libcoin80-dev 3.1.4~abc9f50+dfsg1-1.
This file is owned by root:root, with mode 0o755.
..
/usr/include/Inventor/nodekits/SoAppearanceKit.h
/usr/include/Inventor/nodekits/SoBaseKit.h
/usr/include/Inventor/nodekits/SoCameraKit.h
/usr/include/Inventor/nodekits/SoInteractionKit.h
/usr/include/Inventor/nodekits/SoLightKit.h
/usr/include/Inventor/nodekits/SoNodeKit.h
/usr/include/Inventor/nodekits/SoNodeKitListPart.h
/usr/include/Inventor/nodekits/SoNodekitCatalog.h
/usr/include/Inventor/nodekits/SoSceneKit.h
/usr/include/Inventor/nodekits/SoSeparatorKit.h
/usr/include/Inventor/nodekits/SoShapeKit.h
/usr/include/Inventor/nodekits/SoSubKit.h
/usr/include/Inventor/nodekits/SoWrapperKit.h