On Mon, 21 Oct 2019 at 14:07, Eli Zaretskii <eliz@gnu.org> wrote:

> > From: Richard Copley <rcopley@gmail.com>
> > Date: Mon, 21 Oct 2019 13:28:29 +0100
> >
> > Linking auxiliary executables fails with undefined references to
> (FORTIFY_SOURCE?) functions
> > __memcpy_chk and __memmove_chk. This is apparently caused by some change
> in MSYS2, because
> > previously buildable commits now fail. Transcript below.
>
> Looks like FORTIFY_SOURCE requires linking against -lssp?  Can you try
> adding that, e.g. by
>
>   make LIBS_SYSTEM=-lssp
>

Yes, that works.