bug#65323: build failure on Alpine Linux

[Eli Zaretskii <eliz@gnu.org>]

> From: Bruno Haible <bruno@clisp.org>
> Date: Tue, 15 Aug 2023 23:54:14 +0200
> 
> A build of the current GNU Emacs sources on Alpine Linux 3.18 fails:
> 
> $ ./configure ... --without-all --without-x
> $ make
> ...
> make[2]: Leaving directory '/home/bruno/emacs/doc/misc'
> ./build-aux/install-sh -c -d ./info
> (cd ./doc && \
>  AWK='awk' ../build-aux/make-info-dir ../build-aux/dir_top emacs/emacs.texi lispintro/emacs-lisp-intro.texi lispref/elisp.texi misc/auth.texi misc/autotype.texi misc/bovine.texi misc/calc.texi misc/cc-mode.texi misc/cl.texi misc/dbus.texi misc/dired-x.texi misc/ebrowse.texi misc/ede.texi misc/ediff.texi misc/edt.texi misc/efaq.texi misc/eglot.texi misc/eieio.texi misc/emacs-gnutls.texi misc/emacs-mime.texi misc/epa.texi misc/erc.texi misc/ert.texi misc/eshell.texi misc/eudc.texi misc/eww.texi misc/flymake.texi misc/forms.texi misc/gnus.texi misc/htmlfontify.texi misc/idlwave.texi misc/ido.texi misc/info.texi misc/mairix-el.texi misc/message.texi misc/mh-e.texi misc/modus-themes.org misc/newsticker.texi misc/nxml-mode.texi misc/octave-mode.texi misc/org.org misc/pcl-cvs.texi misc/pgg.texi misc/rcirc.texi misc/reftex.texi misc/remember.texi misc/sasl.texi misc/sc.texi misc/semantic.texi misc/ses.texi misc/sieve.texi misc/smtpmail.texi misc/speedbar.texi misc/srecode.texi misc/todo-mode.texi misc/tramp.texi misc/transient.texi misc/url.texi misc/use-package.texi misc/vhdl-mode.texi misc/vip.texi misc/viper.texi misc/vtable.texi misc/widget.texi misc/wisent.texi misc/woman.texi \
> ) >info/dir.tmp && mv info/dir.tmp info/dir
> awk: bad regex '@value{emacsname}': Invalid contents of {}
> make[1]: *** [Makefile:1186: info/dir] Error 1
> make[1]: Leaving directory '/home/bruno/emacs'
> 
> The problem is apparently the 'awk' program that ships with Alpine Linux:
> 
> $ awk --version
> awk: unrecognized option: version
> BusyBox v1.36.1 (2023-06-02 00:42:02 UTC) multi-call binary.
> 
> Usage: awk [OPTIONS] [AWK_PROGRAM] [FILE]...
> 
>         -v VAR=VAL      Set variable
>         -F SEP          Use SEP as field separator
>         -f FILE         Read program from FILE
>         -e AWK_PROGRAM
> 
> 
> It would be good if the INSTALL file would mention this requirement to
> have a decent 'awk' program.

I think it goes without saying that every program invoked by the build
must be "decent".

Seriously, though: I don't understand what would you like to see
written there about this.  Are we using some feature that is not
standard in Awk?  If not, this should be taken up with Alpine Linux
developers, I think.