Run gem install as external command. [#210 state:resolved]

railties/lib/rails/gem_dependency.rb

@@ -73,7 +73,7 @@ def load_paths_added?
     end
 
     def install
-      Gem::GemRunner.new.run(install_command)
+      puts `#{gem_command} #{install_command.join(' ')}`
     end
     
     def unpack_to(directory)
@@ -100,6 +100,10 @@ def ==(other)
     def specification
       @spec ||= Gem.source_index.search(Gem::Dependency.new(@name, @requirement)).sort_by { |s| s.version }.last
     end
+    
+    def gem_command
+      RUBY_PLATFORM =~ /win32/ ? 'gem.bat' : 'gem'
+    end
 
     def install_command
       cmd = %w(install) << @name