bp_core_install_signups()

function bp_core_install_signups() {
	global $wpdb;

	// Signups is not there and we need it so let's create it.
	require_once( buddypress()->plugin_dir . '/bp-core/admin/bp-core-admin-schema.php' );
	require_once( ABSPATH                  . 'wp-admin/includes/upgrade.php'     );

	// Never use bp_core_get_table_prefix() for any global users tables.
	$wpdb->signups = $wpdb->base_prefix . 'signups';

	// Use WP's core CREATE TABLE query.
	$create_queries = wp_get_db_schema( 'ms_global' );
	if ( ! is_array( $create_queries ) ) {
		$create_queries = explode( ';', $create_queries );
		$create_queries = array_filter( $create_queries );
	}

	// Filter out all the queries except wp_signups.
	foreach ( $create_queries as $key => $query ) {
		if ( preg_match( "|CREATE TABLE ([^ ]*)|", $query, $matches ) ) {
			if ( trim( $matches[1], '`' ) !== $wpdb->signups ) {
				unset( $create_queries[ $key ] );
			}
		}
	}

	// Run WordPress's database upgrader.
	if ( ! empty( $create_queries ) ) {
		dbDelta( $create_queries );
	}
}