/usr/include/bullet/Bullet3OpenCL/ is in libbullet-dev 2.87+dfsg-2.
This file is owned by root:root, with mode 0o755.
..
/usr/include/bullet/Bullet3OpenCL/BroadphaseCollision/
/usr/include/bullet/Bullet3OpenCL/BroadphaseCollision/b3GpuBroadphaseInterface.h
/usr/include/bullet/Bullet3OpenCL/BroadphaseCollision/b3GpuGridBroadphase.h
/usr/include/bullet/Bullet3OpenCL/BroadphaseCollision/b3GpuParallelLinearBvh.h
/usr/include/bullet/Bullet3OpenCL/BroadphaseCollision/b3GpuParallelLinearBvhBroadphase.h
/usr/include/bullet/Bullet3OpenCL/BroadphaseCollision/b3GpuSapBroadphase.h
/usr/include/bullet/Bullet3OpenCL/BroadphaseCollision/b3SapAabb.h
/usr/include/bullet/Bullet3OpenCL/BroadphaseCollision/kernels/
/usr/include/bullet/Bullet3OpenCL/BroadphaseCollision/kernels/gridBroadphaseKernels.h
/usr/include/bullet/Bullet3OpenCL/BroadphaseCollision/kernels/parallelLinearBvhKernels.h
/usr/include/bullet/Bullet3OpenCL/BroadphaseCollision/kernels/sapKernels.h
/usr/include/bullet/Bullet3OpenCL/Initialize/
/usr/include/bullet/Bullet3OpenCL/Initialize/b3OpenCLInclude.h
/usr/include/bullet/Bullet3OpenCL/Initialize/b3OpenCLUtils.h
/usr/include/bullet/Bullet3OpenCL/NarrowphaseCollision/
/usr/include/bullet/Bullet3OpenCL/NarrowphaseCollision/b3BvhInfo.h
/usr/include/bullet/Bullet3OpenCL/NarrowphaseCollision/b3ContactCache.h
/usr/include/bullet/Bullet3OpenCL/NarrowphaseCollision/b3ConvexHullContact.h
/usr/include/bullet/Bullet3OpenCL/NarrowphaseCollision/b3ConvexPolyhedronCL.h
/usr/include/bullet/Bullet3OpenCL/NarrowphaseCollision/b3GjkEpa.h
/usr/include/bullet/Bullet3OpenCL/NarrowphaseCollision/b3OptimizedBvh.h
/usr/include/bullet/Bullet3OpenCL/NarrowphaseCollision/b3QuantizedBvh.h
/usr/include/bullet/Bullet3OpenCL/NarrowphaseCollision/b3StridingMeshInterface.h
/usr/include/bullet/Bullet3OpenCL/NarrowphaseCollision/b3SupportMappings.h
/usr/include/bullet/Bullet3OpenCL/NarrowphaseCollision/b3TriangleCallback.h
/usr/include/bullet/Bullet3OpenCL/NarrowphaseCollision/b3TriangleIndexVertexArray.h
/usr/include/bullet/Bullet3OpenCL/NarrowphaseCollision/b3VectorFloat4.h
/usr/include/bullet/Bullet3OpenCL/NarrowphaseCollision/b3VoronoiSimplexSolver.h
/usr/include/bullet/Bullet3OpenCL/NarrowphaseCollision/kernels/
/usr/include/bullet/Bullet3OpenCL/NarrowphaseCollision/kernels/bvhTraversal.h
/usr/include/bullet/Bullet3OpenCL/NarrowphaseCollision/kernels/mprKernels.h
/usr/include/bullet/Bullet3OpenCL/NarrowphaseCollision/kernels/primitiveContacts.h
/usr/include/bullet/Bullet3OpenCL/NarrowphaseCollision/kernels/satClipHullContacts.h
/usr/include/bullet/Bullet3OpenCL/NarrowphaseCollision/kernels/satConcaveKernels.h
/usr/include/bullet/Bullet3OpenCL/NarrowphaseCollision/kernels/satKernels.h
/usr/include/bullet/Bullet3OpenCL/ParallelPrimitives/
/usr/include/bullet/Bullet3OpenCL/ParallelPrimitives/b3BoundSearchCL.h
/usr/include/bullet/Bullet3OpenCL/ParallelPrimitives/b3BufferInfoCL.h
/usr/include/bullet/Bullet3OpenCL/ParallelPrimitives/b3FillCL.h
/usr/include/bullet/Bullet3OpenCL/ParallelPrimitives/b3LauncherCL.h
/usr/include/bullet/Bullet3OpenCL/ParallelPrimitives/b3OpenCLArray.h
/usr/include/bullet/Bullet3OpenCL/ParallelPrimitives/b3PrefixScanCL.h
/usr/include/bullet/Bullet3OpenCL/ParallelPrimitives/b3PrefixScanFloat4CL.h
/usr/include/bullet/Bullet3OpenCL/ParallelPrimitives/b3RadixSort32CL.h
/usr/include/bullet/Bullet3OpenCL/ParallelPrimitives/kernels/
/usr/include/bullet/Bullet3OpenCL/ParallelPrimitives/kernels/BoundSearchKernelsCL.h
/usr/include/bullet/Bullet3OpenCL/ParallelPrimitives/kernels/CopyKernelsCL.h
/usr/include/bullet/Bullet3OpenCL/ParallelPrimitives/kernels/FillKernelsCL.h
/usr/include/bullet/Bullet3OpenCL/ParallelPrimitives/kernels/PrefixScanKernelsCL.h
/usr/include/bullet/Bullet3OpenCL/ParallelPrimitives/kernels/PrefixScanKernelsFloat4CL.h
/usr/include/bullet/Bullet3OpenCL/ParallelPrimitives/kernels/RadixSort32KernelsCL.h
/usr/include/bullet/Bullet3OpenCL/Raycast/
/usr/include/bullet/Bullet3OpenCL/Raycast/b3GpuRaycast.h
/usr/include/bullet/Bullet3OpenCL/Raycast/kernels/
/usr/include/bullet/Bullet3OpenCL/Raycast/kernels/rayCastKernels.h
/usr/include/bullet/Bullet3OpenCL/RigidBody/
/usr/include/bullet/Bullet3OpenCL/RigidBody/b3GpuConstraint4.h
/usr/include/bullet/Bullet3OpenCL/RigidBody/b3GpuGenericConstraint.h
/usr/include/bullet/Bullet3OpenCL/RigidBody/b3GpuJacobiContactSolver.h
/usr/include/bullet/Bullet3OpenCL/RigidBody/b3GpuNarrowPhase.h
/usr/include/bullet/Bullet3OpenCL/RigidBody/b3GpuNarrowPhaseInternalData.h
/usr/include/bullet/Bullet3OpenCL/RigidBody/b3GpuPgsConstraintSolver.h
/usr/include/bullet/Bullet3OpenCL/RigidBody/b3GpuPgsContactSolver.h
/usr/include/bullet/Bullet3OpenCL/RigidBody/b3GpuRigidBodyPipeline.h
/usr/include/bullet/Bullet3OpenCL/RigidBody/b3GpuRigidBodyPipelineInternalData.h
/usr/include/bullet/Bullet3OpenCL/RigidBody/b3GpuSolverBody.h
/usr/include/bullet/Bullet3OpenCL/RigidBody/b3GpuSolverConstraint.h
/usr/include/bullet/Bullet3OpenCL/RigidBody/b3Solver.h
/usr/include/bullet/Bullet3OpenCL/RigidBody/kernels/
/usr/include/bullet/Bullet3OpenCL/RigidBody/kernels/batchingKernels.h
/usr/include/bullet/Bullet3OpenCL/RigidBody/kernels/batchingKernelsNew.h
/usr/include/bullet/Bullet3OpenCL/RigidBody/kernels/integrateKernel.h
/usr/include/bullet/Bullet3OpenCL/RigidBody/kernels/jointSolver.h
/usr/include/bullet/Bullet3OpenCL/RigidBody/kernels/solveContact.h
/usr/include/bullet/Bullet3OpenCL/RigidBody/kernels/solveFriction.h
/usr/include/bullet/Bullet3OpenCL/RigidBody/kernels/solverSetup.h
/usr/include/bullet/Bullet3OpenCL/RigidBody/kernels/solverSetup2.h
/usr/include/bullet/Bullet3OpenCL/RigidBody/kernels/solverUtils.h
/usr/include/bullet/Bullet3OpenCL/RigidBody/kernels/updateAabbsKernel.h