From 6ae054c3e2da540bc75721c7993403b7a4f4a7a2 Mon Sep 17 00:00:00 2001
From: slackersoft <gregg@slackersoft.net>
Date: Wed, 21 Jan 2015 12:55:07 -0800
Subject: [PATCH] Update contribution guide to mention possible ffi
 dependencies for Ubuntu

Fixes #755
---
 CONTRIBUTING.md | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index 4e3fc9ba..5b46580a 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -67,7 +67,11 @@ To install the Ruby dependencies, you will need Ruby, Rubygems, and Bundler avai
 
     $ bundle
 
-...will install all of the Ruby dependencies.
+...will install all of the Ruby dependencies. If the ffi gem fails to build its native extensions, you may need to manually install some system dependencies. On Ubuntu:
+
+    $ apt-get install gcc ruby ruby-dev libxml2 libxml2-dev libxslt1-dev
+
+...should get you to the point that `bundle` can install everything.
 
 To install the Node dependencies, you will need Node.js, Npm, and [Grunt](http://gruntjs.com/), the [grunt-cli](https://github.com/gruntjs/grunt-cli) and ensure that `grunt` is on your path.