/usr/include/eigen3/Eigen/src/Geometry/ is in libeigen3-dev 3.0.5-1.
This file is owned by root:root, with mode 0o755.
..
/usr/include/eigen3/Eigen/src/Geometry/AlignedBox.h
/usr/include/eigen3/Eigen/src/Geometry/AngleAxis.h
/usr/include/eigen3/Eigen/src/Geometry/EulerAngles.h
/usr/include/eigen3/Eigen/src/Geometry/Homogeneous.h
/usr/include/eigen3/Eigen/src/Geometry/Hyperplane.h
/usr/include/eigen3/Eigen/src/Geometry/OrthoMethods.h
/usr/include/eigen3/Eigen/src/Geometry/ParametrizedLine.h
/usr/include/eigen3/Eigen/src/Geometry/Quaternion.h
/usr/include/eigen3/Eigen/src/Geometry/Rotation2D.h
/usr/include/eigen3/Eigen/src/Geometry/RotationBase.h
/usr/include/eigen3/Eigen/src/Geometry/Scaling.h
/usr/include/eigen3/Eigen/src/Geometry/Transform.h
/usr/include/eigen3/Eigen/src/Geometry/Translation.h
/usr/include/eigen3/Eigen/src/Geometry/Umeyama.h
/usr/include/eigen3/Eigen/src/Geometry/arch/
/usr/include/eigen3/Eigen/src/Geometry/arch/Geometry_SSE.h