Call to undefined function curl_setopt()

[mgibson]

Hi,

I've recently moved a test magento site from ZendCore on windows to ispconfig3 on ubuntu. the main site works fine, until i hit www.domain.com/admin.

I encounter the following:

Fatal error: Call to undefined function curl_setopt() in /var/www/clients/client0/web1/web/lib/Varien/Http/Adapter/Curl.php on line 94

line 94 is:

curl_setopt($this->_getResource(), CURLOPT_URL, $url);

Thank you for your assistance.

Mark.