Ruby on rails - /usr/bin/gcc-4.2：没有这样的文件或目录。错误。符号链接修复不起作用

Question

我正在尝试升级我的rails 3.2.3应用程序。我已经将gemfile更新到gem 'rails', '3.2.11'并运行bundle update rails，但得到以下错误:

    Gem::Installer::ExtensionBuildError: ERROR: Failed to build gem native extension.
        /Users/Arel/.rvm/rubies/ruby-1.9.3-head/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/Arel/.rvm/gems/ruby-1.9.3-head/gems/json-1.7.6 for inspection.
Results logged to /Users/Arel/.rvm/gems/ruby-1.9.3-head/gems/json-1.7.6/ext/json/ext/generator/gem_make.out
An error occured while installing json (1.7.6), and Bundler cannot continue.
Make sure that `gem install json -v '1.7.6'` succeeds before bundling.

所以我尝试了我在各处找到的解决方案，使用命令创建一个符号链接:

sudo ln -s /usr/bin/gcc /usr/bin/gcc-4.2

但是它只返回错误:

ln: /usr/bin/gcc-4.2: File exists

我不太了解如何使用终端在OSX中导航，所以我在这里有点挣扎。什么好主意吗?

Answer 1

/usr/bin/gcc-4.2可能已经是一个符号链接，但是指向一个不存在的文件。