cobc.h
#if defined obc_south || defined obc_north
# if defined obc_south
#  if defined orlanski
#  endif
# endif
# if defined obc_north
#  if defined orlanski
#  endif
# endif
#endif
#if defined obc_west || defined obc_east
# if defined obc_west
#  if defined orlanski
#  endif
# endif
# if defined obc_east
#  if defined orlanski
#  endif
# endif
#endif