CocoaPods on Xcode 6 and Yosemite

This post is for anybody with problems updating CocoaPods, and unable to run the current pod executable.

Extracted from the CocoaPods GitHub Issues, find here the steps necessary to solve this problem and have a new brilliant pod executable working:
1. Open Xcode 6
2. Open Preferences (MenĂș Xcode-Preferences)
3. Click the Locations tab
4. Change the Command Line Tools version to Xcode 6.0
5. Uninstall from a terminal window cocoapods (all installed versions prompted)
$ sudo gem uninstall cocoapods
6. Uninstall xcodeproj (all installed versions prompted)
$ sudo gem uninstall xcodeproj
7. Install xcodeproj
$ sudo gem install xcodeproj
8. Install cocoapods (retry a second time if fails with a error)
$ sudo gem install cocoapods
9. Run pod –version to verify that it worked

Before doing a new installation I found the following error on executing pod:
/System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/lib/ruby/2.0.0/rubygems/core_ext/kernel_require.rb:55:in `require': cannot load such file -- xcodeproj/prebuilt/universal.x86_64-darwin14-2.0.0/xcodeproj_ext (LoadError)
from /System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/lib/ruby/2.0.0/rubygems/core_ext/kernel_require.rb:55:in `require'
from /Library/Ruby/Gems/2.0.0/gems/xcodeproj-0.16.1/lib/xcodeproj/ext.rb:6:in `rescue in '
from /Library/Ruby/Gems/2.0.0/gems/xcodeproj-0.16.1/lib/xcodeproj/ext.rb:3:in `'
from /System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/lib/ruby/2.0.0/rubygems/core_ext/kernel_require.rb:55:in `require'
from /System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/lib/ruby/2.0.0/rubygems/core_ext/kernel_require.rb:55:in `require'
from /Library/Ruby/Gems/2.0.0/gems/xcodeproj-0.16.1/lib/xcodeproj.rb:30:in `'
from /System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/lib/ruby/2.0.0/rubygems/core_ext/kernel_require.rb:55:in `require'
from /System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/lib/ruby/2.0.0/rubygems/core_ext/kernel_require.rb:55:in `require'
from /Library/Ruby/Gems/2.0.0/gems/cocoapods-0.32.1/lib/cocoapods.rb:2:in `'
from /System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/lib/ruby/2.0.0/rubygems/core_ext/kernel_require.rb:55:in `require'
from /System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/lib/ruby/2.0.0/rubygems/core_ext/kernel_require.rb:55:in `require'
from /Library/Ruby/Gems/2.0.0/gems/cocoapods-0.32.1/bin/pod:32:in `'
from /usr/bin/pod:23:in `load'
from /usr/bin/pod:23:in `<main>'

Without doing the steps above, I found imposible to install the updated version of cocoa pods, the installation failed with error:
Fetching: cocoapods-core-0.33.1.gem (100%)
Successfully installed cocoapods-core-0.33.1
Fetching: claide-0.6.1.gem (100%)
Successfully installed claide-0.6.1
Fetching: xcodeproj-0.17.0.gem (100%)
Building native extensions. This could take a while...
ERROR: Error installing cocoapods:
ERROR: Failed to build gem native extension.

"/System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/bin/ruby" -rubygems /Library/Ruby/Gems/2.0.0/gems/rake-10.1.1/bin/rake RUBYARCHDIR=/Library/Ruby/Gems/2.0.0/gems/xcodeproj-0.17.0/ext RUBYLIBDIR=/Library/Ruby/Gems/2.0.0/gems/xcodeproj-0.17.0/ext
/System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/bin/ruby extconf.rb
checking for -std=c99 option to compiler... *** extconf.rb failed ***
Could not create Makefile due to some reason, probably lack of necessary
libraries and/or headers. Check the mkmf.log file for more details. You may
need configuration options.

Provided configuration options:
--with-opt-dir
--without-opt-dir
--with-opt-include
--without-opt-include=${opt-dir}/include
--with-opt-lib
--without-opt-lib=${opt-dir}/lib
--with-make-prog
--without-make-prog
--srcdir=.
--curdir
--ruby=/System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/bin/ruby
/System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/lib/ruby/2.0.0/mkmf.rb:434:in `try_do': The compiler failed to generate an executable file. (RuntimeError)
You have to install development tools first.
from /System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/lib/ruby/2.0.0/mkmf.rb:549:in `block in try_compile'
from /System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/lib/ruby/2.0.0/mkmf.rb:502:in `with_werror'
from /System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/lib/ruby/2.0.0/mkmf.rb:549:in `try_compile'
from extconf.rb:24:in `block in

'
from /System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/lib/ruby/2.0.0/mkmf.rb:895:in `block in checking_for'
from /System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/lib/ruby/2.0.0/mkmf.rb:340:in `block (2 levels) in postpone'
from /System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/lib/ruby/2.0.0/mkmf.rb:310:in `open'
from /System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/lib/ruby/2.0.0/mkmf.rb:340:in `block in postpone'
from /System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/lib/ruby/2.0.0/mkmf.rb:310:in `open'
from /System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/lib/ruby/2.0.0/mkmf.rb:336:in `postpone'
from /System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/lib/ruby/2.0.0/mkmf.rb:894:in `checking_for'
from extconf.rb:23:in `
'
rake aborted!
Command failed with status (1): [/System/Library/Frameworks/Ruby.framework/...]
/Library/Ruby/Gems/2.0.0/gems/xcodeproj-0.17.0/ext/xcodeproj/Rakefile:37:in `block in '
Tasks: TOP => default => ext
(See full trace by running task with --trace)

Gem files will remain installed in /Library/Ruby/Gems/2.0.0/gems/xcodeproj-0.17.0 for inspection.
Results logged to /Library/Ruby/Gems/2.0.0/gems/xcodeproj-0.17.0/ext/xcodeproj/gem_make.out

Hope this could help somebody

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