target dependency bug

[Robert Collins]

given the following

cf_gen_SOURCES = cf_gen.c defines.h
nodist_cf_gen_SOURCES = cf_gen_defines.h
BUILT_SOURCES = cf_gen_defines.h

I think cf_gen_defines.h should be one of the dependencies of
cf_gen.$(OBJEXT). It's not though in my generated Makefile here.
Suggestions?

Rob