新手问题 Ruby 1.9.3 怎么卸载自带的 RubyGems
redmine 安装时需要 rubygems<=1.8，但是安装 ruby1.9.3 自带是 1.8.4
感谢~
感谢，但是按照文档来做的，仍然报错，帮忙看看，感谢！
D:/webserver/Ruby/lib/ruby/gems/1.9.1/gems/rubygems-update-1.8.0/lib/rubygems/pl
atform.rb:189:in <class:Platform>': uninitialized constant Gem::Platform::Depre
cate (NameError)
from D:/webserver/Ruby/lib/ruby/gems/1.9.1/gems/rubygems-update-1.8.0/li
b/rubygems/platform.rb:6:in'
from D:/webserver/Ruby/lib/ruby/site_ruby/1.9.1/rubygems/custom_require.
rb:36:in require'
from D:/webserver/Ruby/lib/ruby/site_ruby/1.9.1/rubygems/custom_require.
rb:36:inrequire'
from D:/webserver/Ruby/lib/ruby/gems/1.9.1/gems/rubygems-update-1.8.0/li
b/rubygems/specification.rb:9:in <top (required)>'
from D:/webserver/Ruby/lib/ruby/site_ruby/1.9.1/rubygems.rb:483:infind
_files'
from D:/webserver/Ruby/lib/ruby/site_ruby/1.9.1/rubygems.rb:1108:in loa
d_plugins'
from D:/webserver/Ruby/lib/ruby/gems/1.9.1/gems/rubygems-update-1.8.0/li
b/rubygems/gem_runner.rb:85:in'
from D:/webserver/Ruby/lib/ruby/site_ruby/1.9.1/rubygems/custom_require.
rb:36:in require'
from D:/webserver/Ruby/lib/ruby/site_ruby/1.9.1/rubygems/custom_require.
rb:36:inrequire'
from setup.rb:25:in `'