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xcodecocoapodsosx-yosemiteosx-yosemite-beta

Cocoapods with Xcode 6 and 10.10 Yosemite

After initially upgrading to 10.10 and XCode6-Beta, I tried to run 'pod update' and I received this error:

cannot load such file -- xcodeproj/prebuilt/universal.x86_64-darwin14-2.0.0/xcodeproj_ext (LoadError)

I tried to update Cocoapods using 'sudo gem install cocoapods', but received another error:

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.

Has anyone else been able to successfully use Cocoapods with Xcode 6 on 10.10 Yosemite?

Solution
    1. Open Xcode 6
    2. Open Preferences
    3. Click the Locations tab
    4. Change the Command Line Tools version to Xcode 6.0
    5. Uninstall cocoapods
      $ sudo gem uninstall cocoapods
    6. Uninstall xcodeproj $ sudo gem uninstall xcodeproj
    7. Install xcodeproj
      $ sudo gem install xcodeproj
    8. Install cocoapods
      $ sudo gem install cocoapods
    9. Run pod --version to verify that it worked