buildconf fails on current HEAD

Hi All, I am trying to build PHP6 (checked out a while from CVS - HEAD) and found that ./buildconf fails. Following are the failure messages : [kraghuba@localhost php6]$ ./buildconf using default Zend directory buildconf: checking installation... buildconf: autoconf version 2.59 (ok) buildconf: Your version of autoconf likely contains buggy cache code. Running cvsclean for you. To avoid this, install autoconf-2.13. rebuilding configure Zend/acinclude.m4:1095: error: m4_defn: undefined macro: _m4_divert_diversion aclocal.m4:1102: PHP_CHECK_SIZEOF is expanded from... autom4te: /usr/bin/m4 failed with exit status: 1 rebuilding main/php_config.h.in autoheader: WARNING: Using auxiliary files such as `acconfig.h', `config.h.bot' autoheader: WARNING: and config.h.top', to define templates for config.h.in' autoheader: WARNING: is deprecated and discouraged. autoheader: autoheader: WARNING: Using the third argument of `AC_DEFINE' and autoheader: WARNING: `AC_DEFINE_UNQUOTED' allows to define a template without autoheader: WARNING: `acconfig.h': autoheader: autoheader: WARNING: AC_DEFINE([NEED_FUNC_MAIN], 1, autoheader: [Define if a function `main' is needed.]) autoheader: autoheader: WARNING: More sophisticated templates can also be produced, see the autoheader: WARNING: documentation. Zend/acinclude.m4:1095: error: m4_defn: undefined macro: _m4_divert_diversion aclocal.m4:1102: PHP_CHECK_SIZEOF is expanded from... autom4te: /usr/bin/m4 failed with exit status: 1 autoheader: /usr/bin/autom4te failed with exit status: 1 Am i doing something wrong ? or something is broken ? Thanks In advance! -- with Regards, Raghubansh