PHP Invalid curl configuration option

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Использую CURL, ответ не получаю, ошибки вот такие:
Notice: Use of undefined constant CURLOPT_URL - assumed 'CURLOPT_URL' in /r/ajax.php on line 6

Warning: curl_setopt() [function.curl-setopt]: Invalid curl configuration option in /r/ajax.php on line 6

Notice: Use of undefined constant CURLOPT_USERAGENT - assumed 'CURLOPT_USERAGENT' in /r/ajax.php on line 7

Warning: curl_setopt() [function.curl-setopt]: Invalid curl configuration option in /r/ajax.php on line 7

Notice: Use of undefined constant CURLOPT_AUTOREFERER - assumed 'CURLOPT_AUTOREFERER' in /r/ajax.php on line 8

Warning: curl_setopt() [function.curl-setopt]: Invalid curl configuration option in /r/ajax.php on line 8

Notice: Use of undefined constant CURLOPT_RETURNTRANSFER - assumed 'CURLOPT_RETURNTRANSFER' in /r/ajax.php on line 9

Warning: curl_setopt() [function.curl-setopt]: Invalid curl configuration option in /r/ajax.php on line 9