trouble building gnuplot from CVS

[Michele S. <mic...@gm...>]

I just made a CVS checkout on my Debian box and I get the following:

$ ./prepare
make: `Makefile.am' is up to date.
make: `Makefile.am' is up to date.
make: `Makefile.am' is up to date.
make: `Makefile.am' is up to date.
make: `Makefile.am' is up to date.
automake: configure.in: required file `../config.guess' not found
automake: configure.in: required file `../config.sub' not found

Some part of the preparation process failed.
Please refer to INSTALL for details.

I am using the last versions of automake and autoconf:

$ automake --version
automake (GNU automake) 1.4-p6

$ autoconf --version
autoconf (GNU Autoconf) 2.59

Any idea of hot to fix this?
Thank you very much,

       Michele Simionato