On a Linux system I installed Drush with Composer and when I try to use it with Drupal 8 alpha-11 I get this error. I looked around but can't find anything about it.
$ drush st
PHP Fatal error: Class 'Drupal\Core\Site\Settings' not found in /home/$USER/.composer/vendor/drush/drush/commands/core/drupal/environment.inc on line 278 Fatal error: Class 'Drupal\Core\Site\Settings' not found in /home/$USER/.composer/vendor/drush/drush/commands/core/drupal/environment.inc on line 278 Drush command terminated abnormally due to an unrecoverable error. [error] Error: Class 'Drupal\Core\Site\Settings' not found in /home/$USER/.composer/vendor/drush/drush/commands/core/drupal/environment.inc, line 278