I installed Tartarus, and since my current curl didn't have SFTP support I've done this . Tartarus worked fine but I started to receive mails:
PHP Warning: PHP Startup: Unable to load dynamic library '/usr/lib/php5/20100525/curl.so' - /usr/local/lib/libcurl.so.4: version `CURL_OPENSSL_3' not found (required by /usr/lib/php5/20100525/curl.so) in Unknown on line 0
After that I've noticed my Magento sites (admin) didn't work. Error log shows this:
[Thu Dec 05 23:33:57 2013] [warn] [client x.x.x.x] mod_fcgid: stderr: PHP Fatal error: Call to undefined function curl_setopt() in /var/www/clients/client1/web6/web/lib/Varien/Http/Adapter/Curl.php on line 87
phpinfo() - there is no curl extension loaded :S
cat /etc/php5/cgi/conf.d/20-curl.ini shows:
; configuration for php CURL module
; priority=20
extension=curl.so
Googled around but without luck :/