/usr/include/bullet/BulletCollision/CollisionDispatch/ is in libbullet-dev 2.83.6+dfsg-3.
This file is owned by root:root, with mode 0o755.
..
/usr/include/bullet/BulletCollision/CollisionDispatch/SphereTriangleDetector.h
/usr/include/bullet/BulletCollision/CollisionDispatch/btActivatingCollisionAlgorithm.h
/usr/include/bullet/BulletCollision/CollisionDispatch/btBox2dBox2dCollisionAlgorithm.h
/usr/include/bullet/BulletCollision/CollisionDispatch/btBoxBoxCollisionAlgorithm.h
/usr/include/bullet/BulletCollision/CollisionDispatch/btBoxBoxDetector.h
/usr/include/bullet/BulletCollision/CollisionDispatch/btCollisionConfiguration.h
/usr/include/bullet/BulletCollision/CollisionDispatch/btCollisionCreateFunc.h
/usr/include/bullet/BulletCollision/CollisionDispatch/btCollisionDispatcher.h
/usr/include/bullet/BulletCollision/CollisionDispatch/btCollisionObject.h
/usr/include/bullet/BulletCollision/CollisionDispatch/btCollisionObjectWrapper.h
/usr/include/bullet/BulletCollision/CollisionDispatch/btCollisionWorld.h
/usr/include/bullet/BulletCollision/CollisionDispatch/btCollisionWorldImporter.h
/usr/include/bullet/BulletCollision/CollisionDispatch/btCompoundCollisionAlgorithm.h
/usr/include/bullet/BulletCollision/CollisionDispatch/btCompoundCompoundCollisionAlgorithm.h
/usr/include/bullet/BulletCollision/CollisionDispatch/btConvex2dConvex2dAlgorithm.h
/usr/include/bullet/BulletCollision/CollisionDispatch/btConvexConcaveCollisionAlgorithm.h
/usr/include/bullet/BulletCollision/CollisionDispatch/btConvexConvexAlgorithm.h
/usr/include/bullet/BulletCollision/CollisionDispatch/btConvexPlaneCollisionAlgorithm.h
/usr/include/bullet/BulletCollision/CollisionDispatch/btDefaultCollisionConfiguration.h
/usr/include/bullet/BulletCollision/CollisionDispatch/btEmptyCollisionAlgorithm.h
/usr/include/bullet/BulletCollision/CollisionDispatch/btGhostObject.h
/usr/include/bullet/BulletCollision/CollisionDispatch/btHashedSimplePairCache.h
/usr/include/bullet/BulletCollision/CollisionDispatch/btInternalEdgeUtility.h
/usr/include/bullet/BulletCollision/CollisionDispatch/btManifoldResult.h
/usr/include/bullet/BulletCollision/CollisionDispatch/btSimulationIslandManager.h
/usr/include/bullet/BulletCollision/CollisionDispatch/btSphereBoxCollisionAlgorithm.h
/usr/include/bullet/BulletCollision/CollisionDispatch/btSphereSphereCollisionAlgorithm.h
/usr/include/bullet/BulletCollision/CollisionDispatch/btSphereTriangleCollisionAlgorithm.h
/usr/include/bullet/BulletCollision/CollisionDispatch/btUnionFind.h