Alpine: strscpy.c:25:1: error: unknown type name 'ssize_t'; did you mean 'size_t'?

[Tianon Gravi]

I'm getting the following error when building the latest "devel"
(23935dbe8513437e69ca14d6b0890067dddceba3) on Alpine Linux 3.17:

| gcc -c   -I. -I../.. -I../.. -I../../lib -I../../include -I.
-I../../lib/intl -I/tmp/bash/lib/intl -DHAVE_CONFIG_H -DSHELL -DDEBUG
-Wno-parentheses -Wno-format-security -g -O2   strscpy.c
| strscpy.c:25:1: error: unknown type name 'ssize_t'; did you mean 'size_t'?
|    25 | ssize_t
|       | ^~~~~~~
|       | size_t
| strscpy.c: In function 'strscpy':
| strscpy.c:32:16: error: 'ssize_t' undeclared (first use in this
function); did you mean 'size_t'?
|    32 |       return ((ssize_t)i);
|       |                ^~~~~~~
|       |                size_t
| strscpy.c:32:16: note: each undeclared identifier is reported only
once for each function it appears in
| strscpy.c:32:24: error: expected ')' before 'i'
|    32 |       return ((ssize_t)i);
|       |              ~         ^
|       |                        )
| make[1]: *** [Makefile:79: strscpy.o] Error 1

Here's a super extra basic `Dockerfile` I used to reproduce this
inside my local Git checkout of bash.git, in case that's useful:

FROM alpine:3.17
RUN apk add --no-cache bison coreutils dpkg dpkg-dev gcc libc-dev make
ncurses-dev patch tar
WORKDIR /tmp/bash
COPY . .
RUN ./configure --enable-readline --with-curses --without-bash-malloc
RUN make
RUN make install
RUN bash --version

I'm happy to do more diagnosing, testing, etc if that would be
helpful, but will need a little guidance to what's actually going to
be useful. 🙇

(my configure output includes the seemingly related "checking for
ssize_t... yes" but I don't know if that's actually helpful
information or not!)

♥,
- Tianon
  4096R / B42F 6819 007F 00F8 8E36  4FD4 036A 9C25 BF35 7DD4