modular build: AM_PROG_LIBTOOL AC_PROG_LIBTOOL problems

[Yotam Medini]

All I want for Passover (PesaX) is to have 
a local modular build of xorg.

Now I cvs checkedout, and working with the 
   ./util/modular/build.sh 
script as documented in:
http://wiki.x.org/wiki/ModularDevelopersGuide

I understand Makefile(s) and simple bash scripts, but
am not an auto{conf,make} expert.

I bumped into several problems all related to libtool macros.
Here are some errors I get:

------------------------------------------------------------------------
autoreconf: running: aclocal -I /home/yotam/xorg/modular/share/aclocal  --output=aclocal.m4t
autoreconf: `aclocal.m4' is updated
autoreconf: configure.ac: tracing
autoreconf: configure.ac: not using Libtool
autoreconf: running: /usr/bin/autoconf
configure.ac:36: error: possibly undefined macro: AC_LIBTOOL_WIN32_DLL
      If this token and others are legitimate, please use m4_pattern_allow.
      See the Autoconf documentation.
configure.ac:37: error: possibly undefined macro: AM_PROG_LIBTOOL
autoreconf: /usr/bin/autoconf failed with exit status: 1

------------------------------------------------------------------------

autoreconf: running: aclocal -I /home/yotam/xorg/modular/share/aclocal  --output=aclocal.m4t
autoreconf: `aclocal.m4' is unchanged
autoreconf: configure.ac: tracing
autoreconf: configure.ac: not using Libtool
autoreconf: running: /usr/bin/autoconf
autoreconf: running: /usr/bin/autoheader
autoreconf: running: automake --add-missing --copy
configure.ac: installing `./mkinstalldirs'
Makefile.am:1: Libtool library used but `LIBTOOL' is undefined
Makefile.am:1: 
Makefile.am:1: The usual way to define `LIBTOOL' is to add `AC_PROG_LIBTOOL'
Makefile.am:1: to `configure.ac' and run `aclocal' and `autoconf' again.
autoreconf: automake failed with exit status: 1
------------------------------------------------------------------------

Any hint?
thanks -- yotam