problems building mustang on debian wheezy x86_64

[mcr]

% git clone git://github.com/nu7hatch/mustang.git
% cd mustang
% rake compile
[1/1] Isolating mocha (>= 0.9).
Fetching: metaclass-0.0.1.gem (100%)
Fetching: mocha-0.12.4.gem (100%)
WARNING: 'require 'rake/rdoctask'' is deprecated. Please use 'require 'rdoc/task' (in RDoc 2.4.2+)' instead.
at /var/lib/gems/1.9.1/gems/rake-0.9.2.2/lib/rake/rdoctask.rb
mkdir -p tmp/x86_64-linux/v8/1.9.3
cd tmp/x86_64-linux/v8/1.9.3
/usr/bin/ruby1.9.1 -I. ../../../../ext/v8/extconf.rb
checking for main() in -lv8... yes
checking for main() in -lpthread... yes
checking for string.h... yes
checking for v8.h... yes
checking for v8-debug.h... yes
checking for v8-profiler.h... yes
checking for rb_sym_to_s()... yes
checking for rb_any_to_ary()... no
creating Makefile
cd -
cd tmp/x86_64-linux/v8/1.9.3
make
compiling ../../../../ext/v8/v8_integer.cpp
In file included from ../../../../ext/v8/v8_ref.h:5:0,
from ../../../../ext/v8/v8_integer.cpp:1:
/usr/include/v8.h:1845:26: error: expected identifier before '&' token
make: *** [v8_integer.o] Error 1
rake aborted!
Command failed with status (2): [make...]

Tasks: TOP => compile => compile:x86_64-linux => compile:v8:x86_64-linux => copy:v8:x86_64-linux:1.9.3 => tmp/x86_64-linux/v8/1.9.3/v8.so
(See full trace by running task with --trace)
[1] 6402 exit 1 rake compile

This happens with a straight gem install.

obiwan-[/sandel/src/mustang] mcr 3235 %sed -n 1845,1845p /usr/include/v8.h
V8EXPORT Local StringValue() const;

this is not the first occurance of V8EXPORT. Xemacs colours this different than the previous occurance.
I suspect something weird in the templates and/or the version of gcc.

obiwan-[/sandel/src/mustang] mcr 3236 %gcc --version
gcc (Debian 4.7.1-7) 4.7.1

Please suggest something else to check...

obiwan-[/sandel/src/mustang] mcr 3237 %uname -a
Linux obiwan 3.2.0-3-amd64 #1 SMP Thu Jun 28 09:07:26 UTC 2012 x86_64 GNU/Linux

Debian wheezy.

[mcr]

obiwan-[/sandel/src/mustang] mcr 3238 %dpkg --list | grep libv8
ii libv8-3.8.9.20 3.8.9.20-1 amd64 v8 JavaScript engine - runtime library
ii libv8-dbg 3.8.9.20-1 amd64 v8 JavaScript engine - debugging symbols
ii libv8-dev 3.8.9.20-1 amd64 v8 JavaScript engine - development files