Update README.md

README.md

@@ -48,7 +48,9 @@ Android NDK (https://developer.android.com/tools/sdk/ndk/index.html)
 	$ export ANDROID_NDK_ARM=<path/to/android_ndk_arm>
 	
 ### Linux
-
+    
+    $ add-apt-repository ppa:vala-team
+    $ apt-get install libgtk-3-dev valac libgee-0.8-dev
     $ apt-get install libpulse-dev libxrandr-dev
 
 ### Windows