Installing civicrm via drush civicrm-install broken

We always used to install civicrm through drush with the following command.

drush --include=sites/all/modules/civicrm/drupal/drush civicrm-install --dbname=chirocivi_civicrm --dbpass='<pass>' --dbuser=<dbuser> --destination=sites/all/modules --site_url=chirocivi.localhost

This doesn't work anymore in civicrm 4.6 (it does in previous versions). (Installing through the UI works fine).
This is the full stack trace.

require_once(DB/common.php): failed to open stream: No such file or directory mysql.php:30 [warning]
PHP Fatal error: require_once(): Failed opening required 'DB/common.php' (include_path='.:/usr/share/php:/usr/share/pear') in /home/mallezie/websites/chirocivi/sites/all/modules/civicrm/packages/DB/mysql.php on line 30
PHP Stack trace:
PHP 1.

() /home/mallezie/.composer/vendor/drush/drush/drush.php:0
PHP 2. drush_main() /home/mallezie/.composer/vendor/drush/drush/drush.php:16
PHP 3. Drush\Boot\DrupalBoot->bootstrap_and_dispatch() /home/mallezie/.composer/vendor/drush/drush/drush.php:76
PHP 4. drush_dispatch() /home/mallezie/.composer/vendor/drush/drush/lib/Drush/Boot/DrupalBoot.php:46
PHP 5. call_user_func_array() /home/mallezie/.composer/vendor/drush/drush/includes/command.inc:178
PHP 6. drush_command() /home/mallezie/.composer/vendor/drush/drush/includes/command.inc:178
PHP 7. _drush_invoke_hooks() /home/mallezie/.composer/vendor/drush/drush/includes/command.inc:210
PHP 8. call_user_func_array() /home/mallezie/.composer/vendor/drush/drush/includes/command.inc:359
PHP 9. drush_civicrm_install() /home/mallezie/.composer/vendor/drush/drush/includes/command.inc:359
PHP 10. _civicrm_install_db() /home/mallezie/websites/chirocivi/sites/all/modules/civicrm/drupal/drush/civicrm.drush.inc:350
PHP 11. civicrm_source() /home/mallezie/websites/chirocivi/sites/all/modules/civicrm/drupal/drush/civicrm.drush.inc:385
PHP 12. DB::connect() /home/mallezie/websites/chirocivi/sites/all/modules/civicrm/install/civicrm.php:135
PHP 13. include_once() /home/mallezie/websites/chirocivi/sites/all/modules/civicrm/packages/DB.php:542
Drush command terminated abnormally due to an unrecoverable error. [error]
Error: require_once(): Failed opening required 'DB/common.php' (include_path='.:/usr/share/php:/usr/share/pear') in
/home/mallezie/websites/chirocivi/sites/all/modules/civicrm/packages/DB/mysql.php, line 30

This problem seems to come from the DB and PEAR packages included with civicrm.
The problem starts inside mysql.php wich tries to include the wrong common.php file.
In mysql.php line 30
require_once 'DB/common.php';

This isn't correct since the mysql.php file is already in the DB folder. Changing this to:
require_once 'common.php';
fixes the first step of the problem.

Once common.php is loaded a new problem arises at rule 30
require_once 'PEAR.php';

This isn't correct either since the PEAR.php file is located one folder up.
Commenting this line fixes the problem.
//require_once 'PEAR.php';

(PEAR.php get's included elsewhere probably with the correct path).

I'm not sure what happened here between civicrm 4.6 and previous versions, neither how to create a PR, since the packages folder isn't from CiviCRM itself.