/usr/include/grits/ is in libgrits-dev 0.8.1-2.
This file is owned by root:root, with mode 0o755.
..
/usr/include/grits/data/
/usr/include/grits/data/grits-data.h
/usr/include/grits/data/grits-http.h
/usr/include/grits/data/grits-tms.h
/usr/include/grits/data/grits-wms.h
/usr/include/grits/gpqueue.h
/usr/include/grits/grits-opengl.h
/usr/include/grits/grits-plugin.h
/usr/include/grits/grits-prefs.h
/usr/include/grits/grits-util.h
/usr/include/grits/grits-viewer.h
/usr/include/grits/grits.h
/usr/include/grits/gtkgl.h
/usr/include/grits/objects/
/usr/include/grits/objects/grits-callback.h
/usr/include/grits/objects/grits-line.h
/usr/include/grits/objects/grits-marker.h
/usr/include/grits/objects/grits-object.h
/usr/include/grits/objects/grits-poly.h
/usr/include/grits/objects/grits-tile.h
/usr/include/grits/objects/grits-volume.h
/usr/include/grits/objects/marching.h
/usr/include/grits/roam.h