[Owncloud] ownCloud 6 from git

[Sean Boran]

I'd like to try the owncloud from git

Following http://owncloud.org/contribute/ :

cd /var/www
   git clone https://github.com/owncloud/core.git owncloud
   git clone https://github.com/owncloud/apps
   git clone https://github.com/owncloud/3rdparty
then
   chown -R www-data:www-data apps config
   mkdir /data;  chown www-data  data;
   mkdir data;  chown www-data  data;
when I visit the website though it stays blank and in the apache log I see

[Tue Dec 03 14:33:24 2013] [error] [client 193.5.238.18] PHP Warning:
 require_once(public/constants.php): failed to open stream: No such file or
directory in /var/www/owncloudcore/lib/base.php on line 23

This is on ubuntu 12.04 + php 5.3.10-1ubuntu3.8.

Any tips please?

Sean
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