/usr/include/freefoam/triSurface/ is in libfreefoam-dev 0.1.0+dfsg+1-3.
This file is owned by root:root, with mode 0o755.
..
/usr/include/freefoam/triSurface/STLpoint.H
/usr/include/freefoam/triSurface/STLpointI.H
/usr/include/freefoam/triSurface/STLtriangle.H
/usr/include/freefoam/triSurface/STLtriangleI.H
/usr/include/freefoam/triSurface/faceTriangulation.H
/usr/include/freefoam/triSurface/geometricSurfacePatch.H
/usr/include/freefoam/triSurface/geometricSurfacePatchList.H
/usr/include/freefoam/triSurface/hashSignedLabel.H
/usr/include/freefoam/triSurface/labelPairLookup.H
/usr/include/freefoam/triSurface/labelledTri.H
/usr/include/freefoam/triSurface/labelledTriI.H
/usr/include/freefoam/triSurface/meshTriangulation.H
/usr/include/freefoam/triSurface/sortLabelledTri.H
/usr/include/freefoam/triSurface/surfacePatch.H
/usr/include/freefoam/triSurface/surfacePatchIOList.H
/usr/include/freefoam/triSurface/surfacePatchList.H
/usr/include/freefoam/triSurface/triSurface.H
/usr/include/freefoam/triSurface/triSurfaceFields.H
/usr/include/freefoam/triSurface/triSurfaceFieldsFwd.H
/usr/include/freefoam/triSurface/triSurfaceGeoMesh.H