我正在尝试安装这样的宝石：
C:\InstantRails\rails_apps\foodmarksthespot>ruby script/plugin install git://github.com/lazyatom/engines.git
哪个返回此消息：
Rails requires RubyGems >= 1.3.1 (you have 1.2.0). Please `gem update --system` and try again.
但是当我尝试更新使用：
gem update --system
它说：
Updating RubyGems Nothing to update
这是在Windows上.如何强制将系统升级到特定版本？
解决方法
http://rubyforge.org/forum/forum.php?forum_id=28071
从那里：
NOTE: RubyGems 1.1 and 1.2 have problems upgrading when there is no rubygems-update installed. You will need to follow the second set of update instructions if you see "Nothing to update". If you have an older version of RubyGems installed,then you can still do it in two steps: $gem install rubygems-update (again,might need to be admin/root) $update_rubygems (... here too)