/usr/include/palabos/parallelism/ is in libplb-dev 1.5~r1+repack1-3.
This file is owned by root:root, with mode 0o755.
..
/usr/include/palabos/parallelism/communicationPackage2D.h
/usr/include/palabos/parallelism/communicationPackage3D.h
/usr/include/palabos/parallelism/headers2D.h
/usr/include/palabos/parallelism/headers2D.hh
/usr/include/palabos/parallelism/headers3D.h
/usr/include/palabos/parallelism/headers3D.hh
/usr/include/palabos/parallelism/mpiManager.h
/usr/include/palabos/parallelism/parallelBlockCommunicator2D.h
/usr/include/palabos/parallelism/parallelBlockCommunicator3D.h
/usr/include/palabos/parallelism/parallelDynamics.h
/usr/include/palabos/parallelism/parallelDynamics.hh
/usr/include/palabos/parallelism/parallelMultiBlockLattice2D.h
/usr/include/palabos/parallelism/parallelMultiBlockLattice2D.hh
/usr/include/palabos/parallelism/parallelMultiBlockLattice3D.h
/usr/include/palabos/parallelism/parallelMultiBlockLattice3D.hh
/usr/include/palabos/parallelism/parallelMultiDataField2D.h
/usr/include/palabos/parallelism/parallelMultiDataField2D.hh
/usr/include/palabos/parallelism/parallelMultiDataField3D.h
/usr/include/palabos/parallelism/parallelMultiDataField3D.hh
/usr/include/palabos/parallelism/parallelStatistics.h
/usr/include/palabos/parallelism/sendRecvPool.h