[TYPO3-50-general] alpha 2 installation fails with an exception

[Domi]

Hi Karsten,

I am running an archlinux on PHP 5.4.11. There might be a PHP module 
missing, but couldn't find the answer yet - and waited.

I call the setup through my vhost http://neostest/setup/ and after 
inserting the login password the error pops up.

#1332169088: Not all requirements are met for the first setup step, 
aborting setup
TYPO3\Setup\Exception thrown in file
/data/www/websites/neos/alpha2/Data/Temporary/Development/Cache/Code/Flow_Object_Classes/TYPO3_Setup_Controller_SetupController_Original.php 
in line 96.
Reference code: 20130129013134a7304f

Thanks for your answer.

Regards,
Dominic