/usr/include/chipmunk/constraints/ is in chipmunk-dev 5.3.4-1.
This file is owned by root:root, with mode 0o755.
..
/usr/include/chipmunk/constraints/cpConstraint.h
/usr/include/chipmunk/constraints/cpDampedRotarySpring.h
/usr/include/chipmunk/constraints/cpDampedSpring.h
/usr/include/chipmunk/constraints/cpGearJoint.h
/usr/include/chipmunk/constraints/cpGrooveJoint.h
/usr/include/chipmunk/constraints/cpPinJoint.h
/usr/include/chipmunk/constraints/cpPivotJoint.h
/usr/include/chipmunk/constraints/cpRatchetJoint.h
/usr/include/chipmunk/constraints/cpRotaryLimitJoint.h
/usr/include/chipmunk/constraints/cpSimpleMotor.h
/usr/include/chipmunk/constraints/cpSlideJoint.h
/usr/include/chipmunk/constraints/util.h