On 8/25/22 14:21, Richard Sandiford wrote:
> Do you know what's going on with these ifndef guards?  How were they
> there before?

There were there since

commit 5213506e247206177045f832a0911db0118a8641
Author: Ralf Wildenhues <ralf.wildenh...@gmx.de>
Date:   Sat Aug 22 13:22:20 2009 +0000

    Regenerate tree using Autoconf 2.64 and Automake 1.11.

So it's very likely dependent on Autoconf version.

Cheers,
Martin

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