public function addHeaderInclude($path)
    {
        $path = trim($path);
        if (strlen($path)) {
            $absPath = GeneralUtility::getFileAbsFileName($path);
            if (is_file($absPath)) {
                $include                                            = file_get_contents($absPath);
                $this->headerIncludes[self::hashResource($include)] = $include;
            }
        }
    }