function bp_add_caps() {
	global $wp_roles;

	// Load roles if not set.
	if ( ! isset( $wp_roles ) ) {
		$wp_roles = new WP_Roles();
	}

	// Loop through available roles and add them.
	foreach( $wp_roles->role_objects as $role ) {
		foreach ( bp_get_caps_for_role( $role->name ) as $cap ) {
			$role->add_cap( $cap );
		}
	}

	/**
	 * Fires after the addition of capabilities to WordPress user roles.
	 *
	 * This is called on plugin activation.
	 *
	 * @since 1.6.0
	 */
	do_action( 'bp_add_caps' );
}