TYPO3.Neos

Hi i have been trying to Install Alpha 5: as described on the website.

The composer install runs fine until the custom install tryis to run:

Generating autoload files
Class TYPO3\Flow\Composer\InstallerScripts is not autoloadable, can not call post-install-cmd script

therefore the flow directory structure is not correctly generated:

here is an List of the directory Struckture i have after the install:

drwxr-xr-x 12 chris chris 408 9 Aug 09:39 .
drwxr-xr-x 9 chris chris 306 9 Aug 09:32 ..
rw-r--r- 1 chris chris 312 9 Aug 09:32 .gitignore
drwxr-xr-x 6 chris chris 204 9 Aug 09:36 Build
drwxr-xr-x 3 chris chris 102 9 Aug 09:32 Configuration
drwxr-xr-x 6 chris chris 204 9 Aug 09:36 Packages
drwxr-xr-x 3 chris chris 102 9 Aug 09:32 Tests
drwxr-xr-x 3 chris chris 102 9 Aug 09:32 Web
drwxr-xr-x 5 chris chris 170 9 Aug 09:37 bin
rw-r--r- 1 chris chris 1455 9 Aug 09:32 build.xml
rw-r--r- 1 chris chris 801 9 Aug 09:32 composer.json
rw-r--r- 1 chris chris 61590 9 Aug 09:37 composer.lock

my commandline to install / Geather the composer loging data:
composer create-project -vvv --dev --stability alpha typo3/neos-base-distribution NeosX > composer_neos.log

system data:
Mac OS X 10.8.4
Composer version 30fb3d48fee4b3b53d7b140525c230a49ad08f05
php version:
PHP 5.3.15 with Suhosin-Patch (cli) (built: Aug 28 2012 18:19:13)
Copyright (c) 1997-2012 The PHP Group
Zend Engine v2.3.0, Copyright (c) 1998-2012 Zend Technologies

if you need any other help or information am glad to help