--- build/build2.mk	2010-05-02 10:32:32.896371436 +0200
+++ build/build2.mk	2010-05-01 12:36:39.307599756 +0200
@@ -29,7 +29,7 @@

 targets = $(TOUCH_FILES) configure $(config_h_in)

-PHP_AUTOCONF ?= 'autoconf'
+PHP_AUTOCONF ?= 'autoconf-2.13'
 PHP_AUTOHEADER ?= 'autoheader'

 SUPPRESS_WARNINGS ?= 2>&1 | (egrep -v '(AC_TRY_RUN called without default to allow cross compiling|AC_PROG_CXXCPP was called before AC_PROG_CXX|defined in acinclude.m4 but never used|AC_PROG_LEX invoked multiple times|AC_DECL_YYTEXT is expanded from...|the top level)'||true)

--- build/buildcheck.sh	2010-05-02 10:31:52.566140604 +0200
+++ build/buildcheck.sh	2010-05-01 12:36:32.556767101 +0200
@@ -25,7 +25,7 @@

 # Allow the autoconf executable to be overridden by $PHP_AUTOCONF.
 if test -z "$PHP_AUTOCONF"; then
-  PHP_AUTOCONF='autoconf'
+  PHP_AUTOCONF='autoconf-2.13'
 fi

 # autoconf 2.13 or newer