Gemfile in twitter_cldr-3.0.2 vs Gemfile in twitter_cldr-3.0.3

@@ -2,13 +2,20 @@
 
 gemspec
 
 group :development, :test do
   gem 'rake'
-  gem 'pry'
-  gem 'pry-nav'
 
-  if RUBY_VERSION >= "1.9" && RUBY_PLATFORM != "java"
+  platform :mri do
+    gem 'pry'
+    gem 'pry-nav'
+  end
+
+  platform :rbx do
+    gem 'rubinius-debugger'
+  end
+
+  if RUBY_VERSION >= "1.9" && RUBY_PLATFORM != "java" && RUBY_ENGINE != "rbx"
     gem 'ruby-prof'
   end
 
   if RUBY_VERSION <= "1.8.7"
     gem 'oniguruma'