Ruby Rails - mac上的gcc问题

我正在尝试在ruby rails上创建我的第一个应用程序 .

• 我在Mac OsX（小牛队）

• 我安装了最新的xCode（5我相信）command line tools

• 我已经安装了bitnami包ruby stack

• 我添加了rails（sudo gem install rails -V）

创建我自己的项目之前的所有步骤---- see here

在ruby控制台中我键入：

sudo rails new helloworld

..然后它会做一些创造性的东西，直到它击中以下几行：

run  bundle install
Fetching gem metadata from https://rubygems.org/..........
Fetching gem metadata from https://rubygems.org/..
Resolving dependencies...
Using rake (10.1.1) 
Using i18n (0.6.9) 
Using minitest (4.7.5) 
Using multi_json (1.8.4) 
Using atomic (1.1.14) 
Using thread_safe (0.1.3) 
Using tzinfo (0.3.38) 
Using activesupport (4.0.2) 
Using builder (3.1.4) 
Using erubis (2.7.0) 
Using rack (1.5.2) 
Using rack-test (0.6.2) 
Using actionpack (4.0.2) 
Using mime-types (1.25.1) 
Using polyglot (0.3.3) 
Using treetop (1.4.15) 
Using mail (2.5.4) 
Using actionmailer (4.0.2) 
Using activemodel (4.0.2) 
Using activerecord-deprecated_finders (1.0.3) 
Using arel (4.0.1) 
Using activerecord (4.0.2) 
Using bundler (1.3.5) 
Using coffee-script-source (1.7.0) 
Using execjs (2.0.2) 
Using coffee-script (2.2.0) 
Using thor (0.18.1) 
Using railties (4.0.2) 
Using coffee-rails (4.0.1) 
Using hike (1.2.3) 
Using jbuilder (1.5.3) 
Using jquery-rails (3.1.0) 
Installing json (1.8.1) 
Gem::Installer::ExtensionBuildError: ERROR: Failed to build gem native extension.

        /Applications/rubystack-1.9.3-19/ruby/bin/ruby extconf.rb 
creating Makefile

make
compiling generator.c
sh: line 1: 58350 Trace/BPT trap: 5       /Applications/Xcode.app/Contents/Developer/usr/bin/xcodebuild -sdk / -find gcc 2> /dev/null
gcc: error: unable to find utility "gcc", not a developer tool or in PATH
make: *** [generator.o] Error 72


Gem files will remain installed in /Applications/rubystack-1.9.3-19/ruby/lib/ruby/gems/1.9.1/gems/json-1.8.1 for inspection.
Results logged to /Applications/rubystack-1.9.3-19/ruby/lib/ruby/gems/1.9.1/gems/json-1.8.1/ext/json/ext/generator/gem_make.out
An error occurred while installing json (1.8.1), and Bundler cannot continue.
Make sure that `gem install json -v '1.8.1'` succeeds before bundling.

在rubyconsole中安装json-1.8.1不起作用 - 我收到以下错误：

sudo gem install json -v '1.8.1'

bash-3.2$ sudo gem install json -v '1.8.1'
Password:
Building native extensions.  This could take a while...
ERROR:  Error installing json:
    ERROR: Failed to build gem native extension.

        /Applications/rubystack-1.9.3-19/ruby/bin/ruby extconf.rb
creating Makefile

make
compiling generator.c
sh: line 1: 60535 Trace/BPT trap: 5       /Applications/Xcode.app/Contents/Developer/usr/bin/xcodebuild -sdk / -find gcc 2> /dev/null
gcc: error: unable to find utility "gcc", not a developer tool or in PATH
make: *** [generator.o] Error 72


Gem files will remain installed in /Applications/rubystack-1.9.3-19/ruby/lib/ruby/gems/1.9.1/gems/json-1.8.1 for inspection.
Results logged to /Applications/rubystack-1.9.3-19/ruby/lib/ruby/gems/1.9.1/gems/json-1.8.1/ext/json/ext/generator/gem_make.out

外面的rubyconsole它工作 . 但是，这并没有解决上述问题 .

我按照以下步骤操作：

How to use/install gcc on Mac OS X 10.8 / Xcode 4.4

我也按照这里的步骤：

http://new-bamboo.co.uk/blog/2013/10/24/3-quick-tips-for-coding-with-os-x-10-9-mavericks

任何帮助将不胜感激..谢谢，乔治

更新：我运行以下内容：

cd /usr/bin
sudo mv gcc gcc_mavs
sudo ln -s /usr/local/Cellar/apple-gcc42/4.2.1-5666.3/bin/gcc-4.2 gcc

现在我收到一条不同的错误消息：

Installing json (1.8.1) 
Gem::Installer::ExtensionBuildError: ERROR: Failed to build gem native extension.

        /Applications/rubystack-1.9.3-19/ruby/bin/ruby extconf.rb 
creating Makefile

make
compiling generator.c
sh: line 1: 67709 Trace/BPT trap: 5       /Applications/Xcode.app/Contents/Developer/usr/bin/xcodebuild -sdk / -find as 2> /dev/null
as: error: unable to find utility "as", not a developer tool or in PATH
make: *** [generator.o] Error 2


Gem files will remain installed in /Applications/rubystack-1.9.3-19/ruby/lib/ruby/gems/1.9.1/gems/json-1.8.1 for inspection.
Results logged to /Applications/rubystack-1.9.3-19/ruby/lib/ruby/gems/1.9.1/gems/json-1.8.1/ext/json/ext/generator/gem_make.out
An error occurred while installing json (1.8.1), and Bundler cannot continue.
Make sure that `gem install json -v '1.8.1'` succeeds before bundling.