Undefined variable: requireSSL

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Undefined variable: requireSSL in /var/www/html/index.php on line 50

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// If page requires SSL, and we're not in SSL mode, 
// redirect to the SSL version of the page
if($requireSSL && $_SERVER['SERVER_PORT'] != 443) {
   header("HTTP/1.1 301 Moved Permanently");
   header("Location: https://".$_SERVER['HTTP_HOST'].$_SERVER['REQUEST_URI']);
   exit();
}