bug in autoconf?

[Jean-Baptiste Nivoit <jean-baptiste nivoit wanadoo fr>]

I just checked out pango (and a few other things) from the Gnome CVS, and
here what i get when doing './autogen.sh --prefix=<my prefix>' :

 automake: configure.in: installing ./install-sh'
 automake: configure.in: installing ./mkinstalldirs'
 automake: configure.in: installing ./missing'
 configure.in: 15: required file ./ltconfig' not found
 automake: Makefile.am: installing ./INSTALL'
 autoconf: Undefined macros:
 ***BUG in Autoconf--please report*** AC_DISABLE_FAST_INSTALL
 ./configure: line 1910: syntax error near unexpected token
 
M_PATH_GLIB_2_0(1.3.1,,'
 ./configure: line 1910: 
M_PATH_GLIB_2_0(1.3.1,,'
 
 Now type 'make' to compile Pango.
 
is this really a bug, or did i do something wrong?
Also the error with AM_PATH_GLIB_2_0 happens when i try to run
autogen on gtk+ (from cvs as well).

-- 
          jb.