how to suppress the included makefile not found warning?

[David Wuertele]

My makefile generates a dependency makefile automatically.  When it
discovers the need to do this, it prints something like this:

  my.mk:65: targetdeps.mk: No such file or directory

This is not an error condition, and I don't really want to know about
it.  It confuses emacs because emacs's compilation-mode considers the
above an error.  When I do a next-error, it jumps to that place in my
makefile.

I want to stop make from printing out this warning, but I don't want
to stop make from automatically generating the targetdeps.mk file.  Is
there a way to just silence the warning?

Thanks,
Dave