Added items to the "Prerequisites" list.

This list should really be factored out into a "Reference Platform" page.

GettingStarted.wiki

diff --git a/GettingStarted.wiki b/GettingStarted.wiki
index 56133fe..8e2430a 100644
--- a/GettingStarted.wiki
+++ b/GettingStarted.wiki
@@ -14,9 +14,16 @@
 
 == Prerequisites == 
 
-Melange depends on two things to be able to set up your system:
+Building, testing, and running Melange depends on installation of a few system packages:
+ * git
+ * libxml2-dev
+ * libxslt-dev
+ * openjdk-7-jdk
  * python (version 2.7)
+ * python-dev
+ * python-lxml
  * virtualenv (version 1.10 or later)
+ * xvfb
 
 == Setting up ==