Outdated libtool creates trouble on macOS

[Marc Glisse]

On Mon, 21 Aug 2023, Marc Glisse wrote:

> because SED is used before it is set. I guess AC_PROG_SED might help, but 
> since all the uses of SED are introduced by autotools, it feels like a bug 
> that they don't add it automatically.

Ah, that normally happens as part of LT_INIT, and what is broken is that 
we use some other libtool autoconf macro before LT_INIT. We should move 
things so GMP_PROG_NM (or at least LT_PATH_NM) is after LT_INIT.

(LT_PATH_NM used to be AC_PROG_NM and not part of libtool I think, so it 
didn't need this ordering in the past)

-- 
Marc Glisse