Git is not notified as required on the project page

Hi

I'm new with vagrant and others associated tools and I've tried this project to understand how provisioning works.

I've installed the project and run a vagrant up. The box has been downloaded and the installation began until to have an error to download Drush.

[default] [Tue, 20 Dec 2011 08:05:13 -0800] FATAL: Stacktrace dumped to /tmp/vagrant-chef-1/chef-stacktrace.out
: stdout
[default] [Tue, 20 Dec 2011 08:05:13 -0800] FATAL: Chef::Exceptions::ShellCommandFailed: git[/usr/share/drush] (drush::head line 20) had an error: Expected process to exit 0, but it exited with 128
---- Begin output of git clone  git://git.drupal.org/project/drush.git /usr/share/drush ----
STDOUT: Initialized empty Git repository in /usr/share/drush/.git/
STDERR: git.drupal.org[0: 140.211.10.6]: errno=Connection timed out
fatal: unable to connect a socket (Connection timed out)
---- End output of git clone  git://git.drupal.org/project/drush.git /usr/share/drush ----
Ran git clone  git://git.drupal.org/project/drush.git /usr/share/drush returned 128
: stdout

In fact I'm working on a fresh install of Ubuntu and I haven't yet installed Git, so the protocol could not be found and Drush could not be downloaded.

Looking through the code I found a more classical way to install it (haven't tried at this moment).

According to the project page and the readme.txt, I found no mention of Git as a prerequisite.
I understand, working with Drupal and do not having Git installed is not anymore imaginable but it could be good to have a mention of the dependency somewhere or Drush should not be downloaded with Git.