Unable to build Guile on macOS

[Aleix Conchillo Flaqué]

Hi there,

After this Gnlib update, I am no longer able to build Guile on macOS:

commit a91b95cca2d397c84f8b9bbd602d40209a7092ce

There are other softwares with the same issue:
https://www.mail-archive.com/bug-wget@gnu.org/msg09941.html

I haven't had time to see if the issue is fixed already or not.

This is the error I'm getting:

  CC       time_rz.lo
  CC       timegm.lo
  CC       malloc/dynarray_at_failure.lo
In file included from regex.c:74:
In file included from ./regexec.c:1362:
./malloc/dynarray-skeleton.c:195:13: error: expected identifier or '('
__nonnull ((1))
            ^
./malloc/dynarray-skeleton.c:195:13: error: expected ')'
./malloc/dynarray-skeleton.c:195:12: note: to match this '('
__nonnull ((1))
           ^
./malloc/dynarray-skeleton.c:205:40: error: expected identifier or '('
__attribute_maybe_unused__ __nonnull ((1))
                                       ^
./malloc/dynarray-skeleton.c:205:40: error: expected ')'
./malloc/dynarray-skeleton.c:205:39: note: to match this '('
__attribute_maybe_unused__ __nonnull ((1))
                                      ^