README.md in rubabel-0.4.2 vs README.md in rubabel-0.4.3

@@ -199,19 +199,19 @@
 
 First, many thanks to Andreas Maunz for packaging openbabel as a gem which makes this install quite painless.
 
 ### Quick Install
 
-On a POSIX system, make sure you have openbabel (including header files), cmake, curl, tar, sed and make {see openbabel instructions}[https://github.com/amaunz/openbabel-gem].  On ubuntu/debian:
+On a POSIX system, make sure you have openbabel (including header files), cmake, curl, tar, sed and make {see openbabel instructions}[https://github.com/amaunz/openbabel-gem].  On a recent ubuntu/debian system, this should work
 
 ```bash
-sudo apt-get install openbabel libopenbabel-dev cmake make curl
+sudo apt-get install ruby ruby-dev openbabel libopenbabel-dev cmake make curl build-essential libcairo-dev
 ```
 
 Then install the gem (which should install the openbabel gem, too):
 
 ```bash
-gem install rubabel
+sudo gem install rubabel
 ```
 
 ### Building from Source
 
 1. download openbabel