/usr/include/geomview/private/ is in libgeomview-dev 1.9.4-4.1.
This file is owned by root:root, with mode 0o755.
..
/usr/include/geomview/private/bboxP.h
/usr/include/geomview/private/bezierP.h
/usr/include/geomview/private/bsptreeP.h
/usr/include/geomview/private/cameraP.h
/usr/include/geomview/private/cmodelP.h
/usr/include/geomview/private/commentP.h
/usr/include/geomview/private/crayolaP.h
/usr/include/geomview/private/discgrpP.h
/usr/include/geomview/private/handleP.h
/usr/include/geomview/private/instP.h
/usr/include/geomview/private/listP.h
/usr/include/geomview/private/meshP.h
/usr/include/geomview/private/mgP.h
/usr/include/geomview/private/mgbufP.h
/usr/include/geomview/private/mgopenglP.h
/usr/include/geomview/private/mgpsP.h
/usr/include/geomview/private/mgribP.h
/usr/include/geomview/private/mgx11P.h
/usr/include/geomview/private/ndmeshP.h
/usr/include/geomview/private/npolylistP.h
/usr/include/geomview/private/pickP.h
/usr/include/geomview/private/pointlistP.h
/usr/include/geomview/private/polylistP.h
/usr/include/geomview/private/quadP.h
/usr/include/geomview/private/skelP.h
/usr/include/geomview/private/sphereP.h
/usr/include/geomview/private/tlistP.h
/usr/include/geomview/private/vectP.h
/usr/include/geomview/private/windowP.h