Re: 'make clean' not working

[Hans Åberg]

> On 23 Sep 2021, at 07:31, Akim Demaille <akim@lrde.epita.fr> wrote:
> 
> Hi Andraea,
> 
>> Le 21 sept. 2021 à 16:45, Andrea Monaco <andrea.monaco@autistici.org> a 
>> écrit :
>> 
>> Hello,
>> 
>> I'm trying to rebuild a bison-3.8 release tree, but "make clean" aborts
>> with this error:
>> 
>> CDPATH="${ZSH_VERSION+.}:" && cd . && /bin/bash 
>> '/root/bison-3.8/build-aux/missing' autoconf
>> /root/bison-3.8/build-aux/missing: line 81: autoconf: command not found
>> WARNING: 'autoconf' is missing on your system.
>>        You should only need it if you modified 'configure.ac',
>>        or m4 files included by it.
>>        The 'autoconf' program is part of the GNU Autoconf package:
>>        <https://www.gnu.org/software/autoconf/>
>>        It also requires GNU m4 and Perl in order to run:
>>        <https://www.gnu.org/software/m4/>
>>        <https://www.perl.org/>
>> Makefile:3894: recipe for target 'configure' failed
>> make: *** [configure] Error 127
>> 
>> Is it expected?
…
> I can't reproduce your problem.  I have run configure, make, make clean,
> make, without any problem (autoconf was not called).  Maybe something was
> touched in your tree, I don't know.

I can reproduce the problem by modifying a file by touching it after the build 
(tried with an m4 file) and making sure autoconf is not in the PATH.