【发布时间】：2012-08-01 22:14:50
【问题描述】：
我最近更新到 Mountain Lion 并重新安装了 Ruby，但是当我尝试运行测试 Rails 应用程序时，我收到一条错误消息，提示我的系统上“当前未安装 Rails”。我照它说的做，输入sudo gem install rails 并得到：
cleared faster_require caches due to new gem install...
Successfully installed rails-3.2.7
1 gem installed
Installing ri documentation for rails-3.2.7...
Installing RDoc documentation for rails-3.2.7...
但是当我检查安装了哪个 Rails 版本时，我得到了以下结果：
Rails is not currently installed on this system. To get the latest version, simply type:
$ sudo gem install rails
You can then rerun your "rails" command.
我也试过gem install rails 并得到：
Building native extensions. This could take a while...
ERROR: Error installing rails:
ERROR: Failed to build gem native extension.
/Users/aileen/.rvm/rubies/ruby-1.9.3-p194/bin/ruby extconf.rb
creating Makefile
make
compiling generator.c
make: /usr/bin/gcc-4.2: No such file or directory
make: *** [generator.o] Error 1
Gem files will remain installed in /Users/aileen/.rvm/gems/ruby-1.9.3-p194@rails327/gems/json-1.7.4 for inspection.
Results logged to /Users/aileen/.rvm/gems/ruby-1.9.3-p194@rails327/gems/json-1.7.4/ext/json/ext/generator/gem_make.out
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标签： ruby-on-rails ruby ruby-c-extension