[Rd] Specifying dependency on a specific patched version

[Gabor Grothendieck]

Is there a way to specify a package dependency in the Depends:
field of the DESCRIPTION file for a specific patched version of a 
specific OS?

For example, today's Windows patched release (2005-05-14) has
the capability of changing the time zone within R on Windows
via Sys.putenv(TZ="GMT") but prior patched versions do not have this.
Is there some way of ensuring that the 2005-05-14 or later release is used
if on Windows only?