Gemfile in csso-rails-0.3.0 vs Gemfile in csso-rails-0.3.1

@@ -1,5 +1,8 @@
 source 'https://rubygems.org'
 
 gemspec
 
-# gem "therubyracer"
+if ENV["EXECJS"] == 'racer'
+  gem "therubyracer"
+#TODO: other backends + automated test
+end
\ No newline at end of file