Changing Redmine root in version 2.1.4-0?

Hi, I know about these instructions to change the Redmine root directory: How to change the default URL to ther root. However, the config there doesn't look like mine at all:

Alias /redmine /private-backup/bitnami/redmine/apps/redmine/htdocs/public

<Directory "/private-backup/bitnami/redmine/apps/redmine/htdocs/public">
  Options -MultiViews
  allow from all
</Directory>

<Location /redmine>
  SetEnv RAILS_RELATIVE_URL_ROOT "/redmine"
  RackBaseURI /redmine
</Location>

PassengerPreStart http://127.0.0.1:8080/redmine

Are there any updated instructions availabe? Stripping all occurences of "redmine" only results in the "we are so sorry" error page.