Make distribution without downloading a second time?

[Justin Smith]

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I intend to upgrade my system to 5.2.1 (is this still RELENG-5_2?) and
would like to also make my own distribution CD's.

If I understand the documentation correctly, running make distribution
will cause a complete (and second) download of the source. But I will
have already updated the source and would just as soon use the current
source that's on my system instead of having make distribution
download it a second time. Is this possible?
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