Re: Build on Ubuntu 18.10 fails due to 'freadseek.c:68:3: error: #error "Please port gnulib freadseek.c to your platform! Look at the definition of getc, getc_unlocked on your system, then report this to bug-gnulib."'

On Sat, Nov 17, 2018 at 11:12:48PM +0100, Karl-Philipp Richter wrote:
> Hi,
> Building `m4` on Ubuntu 18.10 fails due to
> 
> ```
> freadseek.c:68:3: error: #error "Please port gnulib freadseek.c to your
> platform! Look at the definition of getc, getc_unlocked on your system,
> then report this to bug-gnulib."
> ```
> 
> The full build log can be found at
> https://gitlab.com/krichter/m4/-/jobs/121911791.
> 
> experienced with cvs-readonly-359-gd69fa528

And now the same thing happens in Debian unstable due to glibc 2.28:

https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=915152

Do the authors have any suggestion to fix this with minimal changes?

Thanks.