Ubuntu (amd64) build and run dependencies added

README

@@ -19,6 +19,10 @@ Directories structure:
 
 To build BlackBox:
 
+	if you have 64-bit version of Ubuntu, do this:
+		sudo apt-get install libc6-dev-i386
+		sudo apt-get install libgtk2.0-0:i386
+
 	cd BlackBox
 	./switch-target `uname -s` GUI
 	./build