When posix extension is not installed, generates undefined constant error

[Magentron]

 [WARNING] PHP extension posix not loaded, multi-processing support disabled.

   Error:  Undefined constant "Magentron\BladeLint\Console\Commands\SIGKILL"

  at vendor\magentron\laravel-blade-lint\src\Magentron\BladeLint\Console\Commands\BladeLint.php:416
    412▕      */
    413▕     protected function installSignalHandlers()
    414▕     {
    415▕         for ($i = 1; $i <= 15; ++$i) {
  ➜ 416▕             if (SIGKILL === $i) {
    417▕                 continue;
    418▕             }
    419▕
    420▕             pcntl_signal($i, array($this, 'signalHandler'), false);

  1   vendor\magentron\laravel-blade-lint\src\Magentron\BladeLint\Console\Commands\BladeLint.php:170
      Magentron\BladeLint\Console\Commands\BladeLint::installSignalHandlers()

  2   vendor\magentron\laravel-blade-lint\src\Magentron\BladeLint\Console\Commands\BladeLint.php:79
      Magentron\BladeLint\Console\Commands\BladeLint::checkBladeSyntaxFiles()