Re: Fix port/pg_iovec.h building extensions on x86_64-darwin

On Sat, Nov 9, 2024 at 8:08 AM Wolfgang Walther <walther@technowledgy.de> wrote:
> When building pg_cron [1] or pg_hll [2] for PG 17 on x86_64-darwin, we
> encounter the following build failure in nixpkgs:

Out of curiosity, is nixos deliberately using an old macOS deployment
target or SDK, 10.something?  I'm just wondering if our feature
detection is working correctly on macOS/x86, because I'd expect real
preadv/pwritev to be there from 11 onwards, and 11 is already out of
support by Apple.