modification time warning with R CMD check

I often get warnings like the following when running R CMD check

[...]
* checking for code/documentation mismatches ... OK
* checking tests ...
make: *** Warning: File `Makevars' has modification time in the future (2001-11-13 12:54:37.381546042 > 2001-11-13 12:54:37.314975985)
[...]

I am ready to believe that this is not a bug (i.e., that the timing on my
various machines and file systems is such that I am creating a Makevars with a
modification that is 0.07 seconds in the future from the perspective of the
machine that Perl is running on). However, I would think that a
warning would only be justified if this were far enough (1 second? 5 seconds?)
in the future to be "interesting".

I get this too from time to time.  It's actually hard to tell what is
'uninteresting' in general. For example, Linux can create a file in about
50 microseconds on suitable hardware, so a 0.07s lag is easily enough that
files might in principle have been created in the wrong order, messing up
the make algorithm.

Fortunately in building R this sort of lag doesn't matter.
Unfortunately I don't know how to turn the warning off.

	-thomas

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