Re: [PATCH v6 0/5] Reftable support git-core

Han-Wen Nienhuys [off-list ref] writes:

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

quoted

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!) ?

We treat the Makefile macros listed at the top of the file as
authoritative set of knobs, so 

    # Define ZLIB_LACKS_UNCOMPRESS2 if your zlib is so old to lack the
    # function uncompress2().

with conditional compilation/linkage based on the macro would be
minimally sufficient.  Setting it automatically in ./configure is
nice-to-have but is optional.