iounit.h
#if !defined orlanski
# if defined obc_south || defined obc_north
# endif
# if defined obc_west || defined obc_east
# endif
#endif
#if defined coarse_grained_parallelism
#else
#endif
#if !defined orlanski
# if defined obc_south || defined obc_north
# endif
# if defined obc_west || defined obc_east
# endif
#endif