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BuddyBar for bbPress requires WordPressMU, BuddyPress, and bbPress.

It also requires "deep integration" which can be achieved by adding the code below to the top of your bb-config.php file.

if ( !defined( 'ABSPATH' ) & !defined( 'XMLRPC_REQUEST' )) {
    define( 'WP_USE_THEMES', false );
    //
    //  You will need to get the ABSOLUTE path to this file |
    //                                                     \|/
    include_once( '/your/absolute/path/to/wordpress/wp-blog-header.php' );
    header( "HTTP/1.1 200 OK" );
    header( "Status: 200 All rosy" );
}

Use the included abs.php tool to assist you in getting the absolute path. Using http://domain.com/wp-blog-header.php will not work here.

--- Plugins: ---

1. Upload bp-buddybar.php into the "/my-plugins/" directory of your bbPress installation.
2. Activate BuddyBar for bbPress in the "Plugins" admin panel using the "Activate" link.

--- Themes: ---

This plugin will use the existing BuddyPress CSS, so no additional theme files are necessary.

--- Upgrading from an earlier version: ---

1. Overwrite the /my-plugins/bp-buddybar.php file with the latest version.
2. This plugin does not require any changes to your database.