endif and line continue

[Tobias Contreras]

Code snippet:    
    $(OBJ_DIR)/flash_info.o         \
    $(OBJ_DIR)/bootrom_persist.o    \
    $(OBJ_DIR)/rsa.o                \
    $(OBJ_DIR)/sha1.o               \
    $(OBJ_DIR)/crc32.o              \
    $(OBJ_DIR)/bsn.o 
ifdef $(RUNTIME_CRC_TABLE)
$(OBJ_DIR)/crc32init.o          <- *
endif
    $(OBJ_DIR)/osutil.o             \
    $(OBJ_DIR)/main.o               


*when I put a '\' on this line it thinks the endif is on the same line
and I get "missing `endif'.  Stop." And if I don't I get missing
separator.  Stop.
How do you get around that issue?
I am using 3.79, hope that's enough info.
Thanks again.



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