How to "bisect" Cygwin?

[Ryan C. Underwood]

How can I "bisect" Cygwin i.e. by setting a certain date at which to
install packages that were current as of that date, and checking if
problem remains, so as to track down the date a problem/different
behavior was introduced sometime in the past year?  Actually, if I
could start with the Cygwin DLLs themselves, that would probably get
me to the bottom of it.

-- 
Ryan C. Underwood, <nemesis@icequake.net>
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