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class vmware {
  warning("your mac is: $macaddress")

  case $macaddress {
    "00:50:56:*":{
      # ghetto way, but it works until facter 1.3.8+                                                                                                                                                                                                                          
      package { "vmwaretools":
        name => "vmwaretools",
        ensure => present,
      }
    }
  }
}