code: private static function findGetconf()
      {
          $finder = new ExecutableFinder();
          $getconfPath = $finder->find('getconf');
          if ($getconfPath === null) {
              throw new Exception\RuntimeException('Unable to find the "getconf" executable.');
          }
  
          return $getconfPath;
      }
docs: @throws Exception\RuntimeException
  
  @return string