Unwanted autoheader call included in Makefile.in

[Rafael Laboissiere]

When I use the macro AC_CONFIG_HEADERS, automake includes a rule in
Makefile.in to rebuild config.h.in through autoheader.  Now, I do not want
at all that this file gets touched by autoheader, even when I modifiy one of
its "presumed dependencies" aclocal.m4 and configure.ac.

Is that a way to disable this automake behavior, or am I asking for
something that is complete non-sense?

Thanks in advance for your help.

-- 
Rafael