Found the solution.
Hope this helps someone else.

[code]

[...]

# Handle PHP scripts via fastcgi
location ~ ^.+\.php$
{
# set document root
root [docroot];

# test for file existence
# fallback to bootstrap to display 404
try_files $uri /index.php?$args;

# fastcgi setup
fastcgi_pass 127.0.0.1:9000;
# fastcgi_index index.php;
fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name;

# include common fastcgi params
include /etc/nginx/fastcgi_params;
}

[...]

[/code]