Avoid modifying 'configure' or 'makefile' if no changes

Hi all:

I am using Autoconf and Automake in this project of mine:

https://github.com/rdiez/DebugDue/tree/master/Project

If I modify configure.ac by adding and removing a space character (or just issue command "touch configure.ac"), files "configure" and "makefile" are regenerated nevertheless.

The new contents are identical, but their timestamps change, possibly triggering a rebuild, depending on the makefile rules.

Is there a way to prevent updating the timestamps on 'configure' and 'makefile' if the new files are identical?

I thought that Autoconf itself used "install --compare", but probably for copying other files, right?

Thanks in advance,
   rdiez