distdir target

[Robert Collins]

A question: the first few lines of the distdir target (using --foreign
are)

distdir: $(DISTFILES)
        @for file in $(DISTFILES); do \
          d=$(srcdir); \
          dir=`echo "$$file" | sed -e 's,/[^/]*$$,,'`; \


however, the --cygnus option creates

distdir: $(DISTFILES)
        @for file in $(DISTFILES); do \
          if test -f $$file; then d=.; else d=$(srcdir); fi; \
          dir=`echo "$$file" | sed -e 's,/[^/]*$$,,'`; \

Is there any reliable way to get the if test -f $$file;.... line with
automake --foreign?
The files we want to distribute are built files. (We don't want end
users to need shar, but we have icons stored in a shar file for the
developers).

Or is there a built_dist option?

Rob