Gemfile in polyamorous-1.0.0 vs Gemfile in polyamorous-1.1.0

@@ -2,11 +2,23 @@
 gemspec
 
 gem 'rake'
 
 rails = ENV['RAILS'] || 'master'
+arel = ENV['AREL'] || 'master'
 
+arel_opts = case arel
+when /\// # A path
+  {:path => arel}
+when /^v/ # A tagged version
+  {:git => 'git://github.com/rails/arel.git', :tag => arel}
+else
+  {:git => 'git://github.com/rails/arel.git', :branch => arel}
+end
+
+gem 'arel', arel_opts
+
 case rails
 when /\// # A path
   gem 'activerecord', :path => "#{rails}/activerecord"
 when /^v/ # A tagged version
   git 'git://github.com/rails/rails.git', :tag => rails do
@@ -14,6 +26,6 @@
   end
 else
   git 'git://github.com/rails/rails.git', :branch => rails do
     gem 'activerecord'
   end
-end
\ No newline at end of file
+end