diff -r 000000000000 -r 6474c204b198 build/autoconf/subconfigure.m4
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/build/autoconf/subconfigure.m4	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,46 @@
+dnl We are not running in a real autoconf environment. So we're using real m4
+dnl here, not the crazier environment that autoconf provides.
+
+dnl Autoconf expects [] for quotes; give it to them
+changequote([, ])
+
+dnl AC_DEFUN is provided to use instead of define in autoconf. Provide it too.
+define([AC_DEFUN], [define($1, [$2])])
+
+dnl AC_ARG_ENABLE(FEATURE, HELP-STRING, IF-TRUE[, IF-FALSE])
+dnl We have to ignore the help string due to how help works in autoconf...
+AC_DEFUN([AC_ARG_ENABLE],
+[#] Check whether --enable-[$1] or --disable-[$1] was given.
+[if test "[${enable_]patsubst([$1], -, _)+set}" = set; then
+  enableval="[$enable_]patsubst([$1], -, _)"
+  $3
+ifelse([$4], , , [else
+  $4
+])dnl
+fi
+])
+
+dnl AC_MSG_ERROR(error-description)
+AC_DEFUN([AC_MSG_ERROR], [{ echo "configure: error: $1" 1>&2; exit 1; }])
+
+AC_DEFUN([AC_MSG_WARN],  [ echo "configure: warning: $1" 1>&2 ])
+
+dnl Add the variable to the list of substitution variables
+AC_DEFUN([AC_SUBST],
+[
+_subconfigure_ac_subst_args="$_subconfigure_ac_subst_args $1"
+])
+
+dnl Override for AC_DEFINE.
+AC_DEFUN([AC_DEFINE],
+[
+cat >>confdefs.h <<\EOF
+[#define] $1 ifelse($#, 2, [$2], $#, 3, [$2], 1)
+EOF
+cat >> confdefs.pytmp <<\EOF
+    (''' $1 ''', ifelse($#, 2, [r''' $2 '''], $#, 3, [r''' $2 '''], ' 1 '))
+EOF
+])
+
+dnl AC_OUTPUT_SUBDIRS(subdirectory)
+AC_DEFUN([AC_OUTPUT_SUBDIRS], [do_output_subdirs "$1"])