PHP extensions needed

Hi, in the CI 4 README.md file we can read :

## Server Requirements

PHP version 7.2 or higher is required, with the following extensions installed:

- [intl](http://php.net/manual/en/intl.requirements.php)
- [libcurl](http://php.net/manual/en/curl.requirements.php) if you plan to use the HTTP\CURLRequest library

Additionally, make sure that the following extensions are enabled in your PHP:

- json (enabled by default - don't turn it off)
- [mbstring](http://php.net/manual/en/mbstring.installation.php)
- [mysqlnd](http://php.net/manual/en/mysqlnd.install.php)
- xml (enabled by default - don't turn it off)

I have intl, json, mbstring, mysqlnd, xml.
But not libcurl.
However I have curl ; does it enough or this 2 extensions are 2 differents things ? Thanks by advance.