Do it in the Makefile. Untested:
ifneq ($(wildcard $(TOPDIR)/include/net/syncppp.h),)
CFLAGS_driver_name.o += -I $(TOPDIR)/include/net
else
CFLAGS_driver_name.o += -I $(TOPDIR)/drivers/net/wan
endif
and the driver does #include "syncppp.h".
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