I have just been setting up a Ubercart store for a new project on Drupal and was unable to enable the PayPal gateway due to a missing cURL library.

There seems to be quiet a few posts about fixing this with servers running on Windows and not a lot about this for open source OS.

The server in question was Centos running on a VPS.

A guide to resolving this error for both windows and linux is avaialable at the Zend Developer Zone

I recompiled php to finish off enabling cURL with PHP 5.3.1

Started getting errors on all Drupal sites similar to detailed at http://drup.org/drupal-and-php-53

As of 05/02/2009 there seems to be a few problems for certain Drupal modules when upgrading to php 5.3.1

After rolling back php to the last 5.2.x version the issues have dissapeared. This php rollback sounded like a faster solution than applying patches to all the affected drupal modules.