backward compatibility

[Stéphane Thiell]

Hi, I'm using automake 1.6.2 and autoconf 2.53 on a project. It's 
working well, no warning, but then some users who have an old 
autoconf reported me errors such as:

address@hidden pxys]$ make
cd . && /bin/sh /home/pomac/Projects/tmp/pxys/missing --run aclocal-1.6
/home/pomac/Projects/tmp/pxys/missing: aclocal-1.6: command not found
WARNING: `aclocal-1.6' is missing on your system.  You should only need
it if
         you modified `acinclude.m4' or `configure.in'.  You might want
         to install the `Automake' and `Perl' packages.  Grab them from
         any GNU archive site.
cd . && \
  /bin/sh /home/pomac/Projects/tmp/pxys/missing --run automake-1.6
--gnu  --ignore-deps Makefile
/home/pomac/Projects/tmp/pxys/missing: automake-1.6: command not found
WARNING: `automake-1.6' is missing on your system.  You should only need
it if
         you modified `Makefile.am', `acinclude.m4' or `configure.in'.
         You might want to install the `Automake' and `Perl' packages.
         Grab them from any GNU archive site.
cd . && /bin/sh /home/pomac/Projects/tmp/pxys/missing --run autoconf
FATAL ERROR: Autoconf version 2.52 or higher is required for this script
make: *** [configure] Error 1
address@hidden pxys]$


Is there a way to avoid the call to the local "autoconf" by missing, 
as if it wasn't there at all? or at least to replace this FATAL ERROR 
by a simple warning "as if" autoconf wasn't found? :)


Thanks,
--
S. Thiell