drush 6.5.0 (stable)でdrupal-7.34がインストールできない #Drupal

drush-6.5.0(stable) で drush core-quick-drupal すると下記のエラー：

root@cca7fedb262d:/# drush core-quick-drupal --use-existing --root=app --db-url=mysql://drupal@mysql/drupal --db-prefix=drupal_ --yes
You are about to create a sites/default/files directory and DROP all tables in your 'drupal' database. Do you want to continue? (y/n): y
No tables to drop.                                                                                                                                   [ok]
require_once(app/includes/install.core.inc): failed to open stream: No such file or directory site_install.inc:11                                    [warning]
PHP Fatal error:  require_once(): Failed opening required 'app/includes/install.core.inc' (include_path='.:/usr/share/php:/usr/share/pear') in /root/.composer/vendor/drush/drush/commands/core/drupal/site_install.inc on line 11
Drush command terminated abnormally due to an unrecoverable error.                                                                                   [error]
Error: require_once(): Failed opening required 'app/includes/install.core.inc' (include_path='.:/usr/share/php:/usr/share/pear') in
/root/.composer/vendor/drush/drush/commands/core/drupal/site_install.inc, line 11

このあたりが関係してそう：

で、6.xでは対処されていないと思って7.0-devを使ったところ、上手くいった。