/usr/include/gromacs/thread_mpi/ is in gromacs-dev 4.6.5-1build1.
This file is owned by root:root, with mode 0o755.
..
/usr/include/gromacs/thread_mpi/atomic/
/usr/include/gromacs/thread_mpi/atomic.h
/usr/include/gromacs/thread_mpi/atomic/cycles.h
/usr/include/gromacs/thread_mpi/atomic/derived.h
/usr/include/gromacs/thread_mpi/atomic/fujitsu_sparc64.h
/usr/include/gromacs/thread_mpi/atomic/gcc.h
/usr/include/gromacs/thread_mpi/atomic/gcc_ia64.h
/usr/include/gromacs/thread_mpi/atomic/gcc_intrinsics.h
/usr/include/gromacs/thread_mpi/atomic/gcc_ppc.h
/usr/include/gromacs/thread_mpi/atomic/gcc_spinlock.h
/usr/include/gromacs/thread_mpi/atomic/gcc_x86.h
/usr/include/gromacs/thread_mpi/atomic/msvc.h
/usr/include/gromacs/thread_mpi/atomic/suncc-sparc.h
/usr/include/gromacs/thread_mpi/atomic/xlc_ppc.h
/usr/include/gromacs/thread_mpi/barrier.h
/usr/include/gromacs/thread_mpi/collective.h
/usr/include/gromacs/thread_mpi/event.h
/usr/include/gromacs/thread_mpi/hwinfo.h
/usr/include/gromacs/thread_mpi/list.h
/usr/include/gromacs/thread_mpi/lock.h
/usr/include/gromacs/thread_mpi/mpi_bindings.h
/usr/include/gromacs/thread_mpi/mutex.h
/usr/include/gromacs/thread_mpi/numa_malloc.h
/usr/include/gromacs/thread_mpi/system_error.h
/usr/include/gromacs/thread_mpi/threads.h
/usr/include/gromacs/thread_mpi/tmpi.h
/usr/include/gromacs/thread_mpi/visibility.h
/usr/include/gromacs/thread_mpi/wait.h