Gemfile in therubyracer-0.12.0 vs Gemfile in therubyracer-0.12.1

@@ -1,9 +1,11 @@
 source 'http://rubygems.org'
 
 gemspec
 
+gem "rubysl", :platforms => :rbx
 gem 'redjs', :git => 'https://github.com/cowboyd/redjs.git'
 gem "rake"
 gem "rspec", "~> 2.0"
 gem "rake-compiler"
-gem 'gem-compiler' unless Object.const_defined?(:RUBY_ENGINE) && RUBY_ENGINE == 'rbx'
+gem "gem-compiler", :platforms => :mri
+