On Wed, Feb 19, 2020 at 7:10 PM Junio C Hamano [off-list ref] wrote:

It is OK (and indeed you're right that you cannot avoid it) to ship
a reasonably new snapshot as a fallback in such a case, but it still
is far more preferrable to avoid linking with the fallback snapshot
copy when a working one is available on the system, especially for a
widely used and established library like zlib, because we have one
less thing to keep up-to-date with the security patches made to the
upstream.

what is the procedure for doing this? Do I need to write autoconf
macros (oh no!) ?

I've added a comment for now in system.h

 reftable/.gitattributes | 1 +
 1 file changed, 1 insertion(+)

thanks, I've put this in.
-- 
Han-Wen Nienhuys - hanwenn@gmail.com - http://www.xs4all.nl/~hanwen