obc_data.h
#if defined obc_south || defined obc_north
#endif
#if defined obc_west || defined obc_east
#endif
#if defined obc_south
#endif
#if defined obc_north
#endif
#if defined obc_west
#endif
#if defined obc_east
#endif
#if defined obc_south
#endif
#if defined obc_north
#endif
#if defined obc_west
#endif
#if defined obc_east
#endif
#if defined obc_west && defined obc_east
#endif