Gemfile in ransack-0.5.3 vs Gemfile in ransack-0.5.4

@@ -1,15 +1,40 @@
 source "http://rubygems.org"
 gemspec
 
-if ENV['RAILS_VERSION'] == 'release'
-  gem 'activesupport'
-  gem 'activerecord'
-  gem 'actionpack'
+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
-  gem 'arel',  :git => 'git://github.com/rails/arel.git'
-  git 'git://github.com/rails/rails.git' do
+  {:git => 'git://github.com/rails/arel.git', :branch => arel}
+end
+
+gem 'arel', arel_opts
+
+case rails
+when /\// # A path
+  gem 'activesupport', :path => "#{rails}/activesupport"
+  gem 'activemodel', :path => "#{rails}/activemodel"
+  gem 'activerecord', :path => "#{rails}/activerecord"
+  gem 'actionpack', :path => "#{rails}/activerecord"
+when /^v/ # A tagged version
+  git 'git://github.com/rails/rails.git', :tag => rails do
     gem 'activesupport'
+    gem 'activemodel'
+    gem 'activerecord'
+    gem 'actionpack'
+  end
+else
+  git 'git://github.com/rails/rails.git', :branch => rails do
+    gem 'activesupport'
+    gem 'activemodel'
     gem 'activerecord'
     gem 'actionpack'
   end
 end
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