building libXrender : ./config.status[12]: export: SHELL##: is not an identifier

[Richard PALO]

Trying out a full build as indicated on the Wiki using
> cd $HOME/src
> git clone git://anongit.freedesktop.org/git/xorg/util/modular util/modular
> mkdir $HOME/build
> cd $HOME/src
> ./util/modular/build.sh --clone $HOME/build

this is on openindiana (SunOS 5.11) with pkgsrc gnu tools including 
gcc4.7.2 autoconf 2.69  automake 1.13.1 pkg-config 0.28
native solaris shells

seems to go great until libXrender:
> ======================================================================
> ==  Processing module/component:  "lib/libXrender"
> ==        configuration options:
> Cloning into 'lib/libXrender'...
> remote: Counting objects: 402, done.
> remote: Compressing objects: 100% (175/175), done.
> remote: Total 402 (delta 241), reused 324 (delta 191)
> Receiving objects: 100% (402/402), 83.92 KiB | 103 KiB/s, done.
> Resolving deltas: 100% (241/241), done.
> autoreconf: Entering directory `.'
> autoreconf: configure.ac: not using Gettext
> autoreconf: running: aclocal -I /home/richard/build//share/aclocal
...
> checking whether malloc(0) returns NULL... yes
> checking for RENDER... yes
> checking that generated files are newer than configure... done
> configure: creating ./config.status
> ./config.status[12]: export: SHELL##: is not an identifier
> build.sh: "autogen.sh" failed on lib/libXrender
> build.sh: error processing module/component:  "lib/libXrender"

indeed the first few lines confirm in config.status:
> richard at devzoneX:~/src/lib/libXrender$ more config.status
> #! /bin/sh
> # Generated by configure.
> # Run this file to recreate the current configuration.
> # Compiler output produced by configure, useful for debugging
> # configure, is in config.log if it exists.
>
> debug=false
> ac_cs_recheck=false
> ac_cs_silent=false
>
> SHELL=${CONFIG_SHELL-/bin/sh}
> export SHELL## -------------------- ##
> ## M4sh Initialization. ##
> ## -------------------- ##


If I specifically checkout libXrender-0.9.7, then configure seems to 
work ok. (!)

the only differences I see between master and 0.9.7 are:
> richard at devzoneX:~/src/lib/libXrender$ git diff master
> diff --git a/autogen.sh b/autogen.sh
> index fc34bd5..904cd67 100755
> --- a/autogen.sh
> +++ b/autogen.sh
> @@ -9,6 +9,4 @@ cd $srcdir
>  autoreconf -v --install || exit 1
>  cd $ORIGDIR || exit $?
>
> -if test -z "$NOCONFIGURE"; then
> -    $srcdir/configure "$@"
> -fi
> +$srcdir/configure --enable-maintainer-mode "$@"
> diff --git a/configure.ac b/configure.ac
> index 19dce7a..bf7fe60 100644
> --- a/configure.ac
> +++ b/configure.ac
> @@ -36,6 +36,7 @@ AC_CONFIG_HEADERS([config.h])
>
>  # Initialize Automake
>  AM_INIT_AUTOMAKE([foreign dist-bzip2])
> +AM_MAINTAINER_MODE
>
>  # Initialize libtool
>  AC_PROG_LIBTOOL

It appears 'configure' spews when AM_MAINTAINER_MODE is removed from 
configure.ac and autoreconf is run, there must be some funkiness in 
there that I can't seem to quickly pinpoint...