Ruby Rails - issue with gcc on mac - ruby-on-rails

Question

I am trying to create my first application on ruby rails.
I am on Mac OsX (Mavericks)
I have the latest xCode installed (5 i believe) + command line tools
I have installed the bitnami bundle ruby stack
I have added rails (sudo gem install rails -V)
All steps until creating my own project work ---- see here
In the ruby console I type:
sudo rails new helloworld
.. then it does some creational stuff till it hits the following lines:
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.
Installing json-1.8.1 within rubyconsole doesn't work - I get the following error:
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
Outside rubyconsole it works. However, that does not solve the issue above.
I followed these steps:
How to use/install gcc on Mac OS X 10.8 / Xcode 4.4
I also followed the steps here:
http://new-bamboo.co.uk/blog/2013/10/24/3-quick-tips-for-coding-with-os-x-10-9-mavericks
Any help would be much appreciated .. Thanks, George
UPDATE: I run the following:
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
Now I get a different error message:
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.

Answer 1

Ok, completely removed xcode & developer tools.
Reinstalled xocode 5.02 & developer tools for maverick (late october)
run the following command:
sudo xcode-select -switch /Library/Developer/CommandLineTools
Sovled.