/usr/include/Inventor/actions/ is in inventor-dev 2.1.5-10-21.
This file is owned by root:root, with mode 0o755.
..
/usr/include/Inventor/actions/SoAction.h
/usr/include/Inventor/actions/SoActions.h
/usr/include/Inventor/actions/SoBoxHighlightRenderAction.h
/usr/include/Inventor/actions/SoCallbackAction.h
/usr/include/Inventor/actions/SoGLRenderAction.h
/usr/include/Inventor/actions/SoGetBoundingBoxAction.h
/usr/include/Inventor/actions/SoGetMatrixAction.h
/usr/include/Inventor/actions/SoHandleEventAction.h
/usr/include/Inventor/actions/SoLineHighlightRenderAction.h
/usr/include/Inventor/actions/SoPickAction.h
/usr/include/Inventor/actions/SoRayPickAction.h
/usr/include/Inventor/actions/SoSearchAction.h
/usr/include/Inventor/actions/SoSubAction.h
/usr/include/Inventor/actions/SoWriteAction.h