How to enable cURL php extension in Apache2?

[Csanyi Pal <csanyipal@gmail.com>]

Hi,

I just upgraded Squeeze to Wheezy, and have difficulties with cURL PHP
extension: I can't enable it.

I have installed following packages related to this issue:
curl, libcurl3, libcurl3-gnutls, php5-curl.

I know that cURL extension is not enabled because I want to install
Moodle and it complains about cURL extension.

How can I solve this problem?

-- 
Regards from Pal