ruby - 乘客:无法加载此类文件 ruby​​gems/builder

Question

我试图用 Apache2 和 ruby​​ 2.0 安装 passenger，但我在安装时遇到了这行错误:

passenger-install-apache2-module

错误:

--------------------------------------------
Compiling and installing Apache 2 module...
cd /usr/local/lib/ruby/gems/2.0.0/gems/passenger-3.0.19
/usr/local/bin/ruby /usr/local/bin/rake apache2:clean apache2 RELEASE=yes
# /usr/local/bin/ruby /usr/local/bin/rake apache2:clean apache2 RELEASE=yes
rake aborted!
cannot load such file -- rubygems/builder

(See full trace by running task with --trace)

--------------------------------------------

It looks like something went wrong

我试过:

gem install builder

但是还是会出现这个错误。我该如何解决？

---

编辑

ruby 版本:

2.0 p2

gem list :

bigdecimal (1.2.0)
builder (3.2.0)
bundler (1.3.1)
daemon_controller (1.1.1)
fastthread (1.0.7)
io-console (0.4.2)
json (1.7.7)
minitest (4.3.2)
passenger (3.0.19)
psych (2.0.0)
rack (1.5.2)
rack-protection (1.4.0)
rake (0.9.6)
rdoc (4.0.0)
sinatra (1.3.5)
test-unit (2.0.0.0)
tilt (1.3.4)

Answer 1

更新说明:

$ gem install passenger --version 4.0.0.rc6
$ passenger-install-apache2-module