Question about dependencies

[Gilles Gigan]

Hi,
i have a question about automatically generating prerequisites as
explained in section 4.14 of the make manual:
If I understand this section correctly, the .d files must be shipped
with the source code and must not be removed by a "clean" target.
Otherwise, the next "make" will complain about not being able to
include them, even though they will be generated afterwards.
Is this correct ?

Now, I would like to get around having to ship these files with the
source code. Is there a way to have make generate these .d files IFF
they are missing, and then include them ?

Gilles