Documentation (and detailed install instructions) can be found 
online at https://reductivelabs.com/projects/puppet/documentation.
Generally, you need the following things installed:
* Ruby >= 1.8.1 (earlier releases might work but probably not)
* The Ruby OpenSSL library.  For some reason, this often isn't included
  in the main ruby distributions.  You can test for it by running
  'ruby -ropenssl -e "puts :yep"'.  If that errors out, you're missing the
  library.
  If your distribution doesn't come with the necessary library (e.g., on Debian
  and Ubuntu you need to install libopenssl-ruby), then you'll probably have to
  compile Ruby yourself, since it's part of the standard library and not
  available separately.  You could probably just compile and install that one
  library, though.
* The Ruby XMLRPC client and server libraries.  For some reason, this often
  isn't included in the main ruby distributions.  You can test for it by
  running 'ruby -rxmlrpc/client -e "puts :yep"'.  If that errors out, you're missing
  the library.
* Facter => 1.1.1
  You can get this from https://reductivelabs.com/projects/facter
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