Re: python3.13 fails to build on macOS 26

[Greg Troxel <gdt%lexort.com@localhost>]

Martin Husemann <martin%duskware.de@localhost> writes:

> On Wed, Jun 17, 2026 at 07:16:35PM -0400, Greg Troxel wrote:
>> This is because python wants newfangled expat_config.h, missing in macOS
>> system expat (and NetBSD system expat until well after 11).  I have
>> extended the "prefer pkgsrc" conditional and not yet committed it.
>
> JFYI: expat on netbsd-11 and -current is in sync now (and this is included
> in 11.0_RC5).

The code that conditions builtin expat on netbsd version shouldn't be
there.  And it's wrong for packages to set PREFER anyway.   We should
fix this by declaring needed versions in depending packages, or making a
global decision and look for the new header.  Then we can gc the if
netbsd PREFER block.