> CC c-stack.o
> In file included from /usr/include/signal.h:328,
> from ./signal.h:52,
> from c-stack.c:49:
> c-stack.c:55:27: error: missing binary operator before token "("
> 55 | #elif HAVE_LIBSIGSEGV && (SIGSTKSZ < 16384)
> | ^~~~~~~~Fix committed in Gnulib on 2020-10-03 and is included in m4 1.4.19. Bruno
