/usr/include/psurface/ is in libpsurface-dev 2.0.0-2+b1.
This file is owned by root:root, with mode 0o755.
..
/usr/include/psurface/AmiraMeshIO.h
/usr/include/psurface/Box.h
/usr/include/psurface/CircularPatch.h
/usr/include/psurface/ContactMapping.h
/usr/include/psurface/DirectionFunction.h
/usr/include/psurface/DomainPolygon.h
/usr/include/psurface/Domains.h
/usr/include/psurface/EdgeIntersectionFunctor.h
/usr/include/psurface/GlobalNodeIdx.h
/usr/include/psurface/GmshIO.h
/usr/include/psurface/Hdf5IO.h
/usr/include/psurface/HxParamToolBox.h
/usr/include/psurface/IntersectionPrimitive.h
/usr/include/psurface/IntersectionPrimitiveCollector.h
/usr/include/psurface/MultiDimOctree.h
/usr/include/psurface/Node.h
/usr/include/psurface/NodeBundle.h
/usr/include/psurface/NormalProjector.h
/usr/include/psurface/PSurface.h
/usr/include/psurface/PSurfaceFactory.h
/usr/include/psurface/PSurfaceSmoother.h
/usr/include/psurface/PathVertex.h
/usr/include/psurface/PlaneParam.h
/usr/include/psurface/PointIntersectionFunctor.h
/usr/include/psurface/QualityRequest.h
/usr/include/psurface/SparseMatrix.h
/usr/include/psurface/StaticMatrix.h
/usr/include/psurface/StaticVector.h
/usr/include/psurface/SurfaceBase.h
/usr/include/psurface/SurfaceParts.h
/usr/include/psurface/TargetSurface.h
/usr/include/psurface/Triangulator.h
/usr/include/psurface/VertexHeap.h
/usr/include/psurface/VtkIO.h
/usr/include/psurface/b64enc.hh
/usr/include/psurface/common.hh
/usr/include/psurface/dataarraywriter.hh
/usr/include/psurface/indent.hh
/usr/include/psurface/psurfaceAPI.h
/usr/include/psurface/streams.hh
/usr/include/psurface/vtuwriter.hh