/usr/ is in libgrits-dev 0.7-1.
This file is owned by root:root, with mode 0o755.
..
/usr/include/
/usr/include/grits/
/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/objects/
/usr/include/grits/objects/grits-object.h
/usr/include/grits/objects/grits-marker.h
/usr/include/grits/objects/grits-callback.h
/usr/include/grits/objects/grits-tile.h
/usr/include/grits/objects/grits-volume.h
/usr/include/grits/objects/grits-poly.h
/usr/include/grits/objects/grits-line.h
/usr/include/grits/objects/marching.h
/usr/include/grits/grits.h
/usr/include/grits/grits-viewer.h
/usr/include/grits/grits-prefs.h
/usr/include/grits/grits-opengl.h
/usr/include/grits/grits-plugin.h
/usr/include/grits/grits-util.h
/usr/include/grits/gtkgl.h
/usr/include/grits/gpqueue.h
/usr/include/grits/roam.h
/usr/lib/
/usr/lib/pkgconfig/
/usr/lib/pkgconfig/grits.pc
/usr/share/
/usr/share/doc/
/usr/share/doc/libgrits-dev/
/usr/share/doc/libgrits-dev/copyright
/usr/share/doc/libgrits-dev/examples/
/usr/share/doc/libgrits-dev/examples/teapot.c
/usr/share/doc/libgrits-dev/examples/teapot.h
/usr/share/doc/libgrits-dev/examples/grits-test.c
/usr/share/doc/libgrits-dev/examples/grits-demo.c.gz
/usr/lib/libgrits.so
/usr/share/doc/libgrits-dev/changelog.Debian.gz