title: Unable to update cocoapods
body: <p>Prior to trying to update my cocoapods I was on:</p>
  
  <pre><code>pod --version
  </code></pre>
  
  <p>0.22.3</p>
  
  <p>Whenever I do a pod install I see the following message in my console:</p>
  
  <pre><code>CocoaPods 0.26.2 is available.
  </code></pre>
  
  <p>However every time I try to update Cocoapods it does not seem to work:</p>
  
  <pre><code>$ sudo gem install cocoapods
  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/1.8/usr/bin/ruby extconf.rb
  checking for -std=c99 option to compiler... yes
  checking for CoreFoundation... yes
  checking for CoreFoundation/CoreFoundation.h... yes
  checking for CoreFoundation/CFStream.h... yes
  checking for CoreFoundation/CFPropertyList.h... yes
  checking for ruby/st.h... yes
  creating extconf.h
  creating Makefile
  
  make
  xcrun cc -I. -I. -I/System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/universal-darwin12.0 -I. -DRUBY_EXTCONF_H=\"extconf.h\"  -D_XOPEN_SOURCE -D_DARWIN_C_SOURCE   -fno-common -arch i386 -arch x86_64 -g -Os -pipe -fno-common -DENABLE_DTRACE  -fno-common  -pipe -fno-common  -std=c99  -c xcodeproj_ext.c
  xcrun: Error: could not stat active Xcode path '/Volumes/Xcode/Xcode.app/Contents/Developer'. (No such file or directory)
  cc -arch i386 -arch x86_64 -pipe -bundle -undefined dynamic_lookup -o xcodeproj_ext.bundle xcodeproj_ext.o -L. -L/System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib -L. -arch i386 -arch x86_64  -ObjC -framework CoreFoundation    -lruby  -lpthread -ldl -lobjc  
  clang: error: no such file or directory: 'xcodeproj_ext.o'
  make: *** [xcodeproj_ext.bundle] Error 1
  
  
  Gem files will remain installed in /Library/Ruby/Gems/1.8/gems/xcodeproj-0.13.1 for inspection.
  Results logged to /Library/Ruby/Gems/1.8/gems/xcodeproj-0.13.1/ext/xcodeproj/gem_make.out
  
  
  
  pod --version
  0.22.3
  </code></pre>