/usr/include/kido/constraint/ is in libkido-dev 0.1.0+dfsg-2build9.
This file is owned by root:root, with mode 0o755.
..
/usr/include/kido/constraint/BalanceConstraint.hpp
/usr/include/kido/constraint/BallJointConstraint.hpp
/usr/include/kido/constraint/ConstrainedGroup.hpp
/usr/include/kido/constraint/ConstraintBase.hpp
/usr/include/kido/constraint/ConstraintSolver.hpp
/usr/include/kido/constraint/ContactConstraint.hpp
/usr/include/kido/constraint/DantzigLCPSolver.hpp
/usr/include/kido/constraint/JointConstraint.hpp
/usr/include/kido/constraint/JointCoulombFrictionConstraint.hpp
/usr/include/kido/constraint/JointLimitConstraint.hpp
/usr/include/kido/constraint/LCPSolver.hpp
/usr/include/kido/constraint/PGSLCPSolver.hpp
/usr/include/kido/constraint/ServoMotorConstraint.hpp
/usr/include/kido/constraint/SoftContactConstraint.hpp
/usr/include/kido/constraint/WeldJointConstraint.hpp
/usr/include/kido/constraint/constraint.hpp