function bp_xprofile_add_xprofile_query_to_user_query( BP_User_Query $q ) {

	// Bail if no `xprofile_query` clause.
	if ( empty( $q->query_vars['xprofile_query'] ) ) {
		return;
	}

	$xprofile_query = new BP_XProfile_Query( $q->query_vars['xprofile_query'] );
	$sql            = $xprofile_query->get_sql( 'u', $q->uid_name );

	if ( ! empty( $sql['join'] ) ) {
		$q->uid_clauses['select'] .= $sql['join'];
		$q->uid_clauses['where'] .= $sql['where'];
	}
}