Gemfile in rib-1.1.6 vs Gemfile in rib-1.2.0

@@ -8,8 +8,13 @@
 gem 'muack'
 
 gem 'bond'
 gem 'hirb'
 
-platforms(:ruby) do
+platforms :ruby do
   gem 'readline_buffer'
+end
+
+platforms :rbx do
+  gem 'rubysl-singleton' # used in rake
+  gem 'rubysl-readline'  # we need readline extension
 end