Error on "setup.py build"

I tried to install the new 5.0rc1 from source (tar.gz), and got an error from setup/build script.

How to reproduce:
Donwload (http://openerp.com/download/development/source/openerp-server-5.0.0-rc1.tar.gz) and unzip it.
Try to build:

$ python setup.py build
(...)
running build_scripts
creating build/scripts-2.5
warning: build_scripts: openerp-server is an empty file (skipping)
error: build/scripts-2.5/openerp-server: No such file or directory