title: Unable to install Cocoapods on Yosemite DP 7
body: <p>I am having trouble installing Cocoapods on Yosemite DP 7 installed on a separate partition. I already attempted following the instructions found on <a href="https://stackoverflow.com/questions/24018355/cocoapods-with-xcode-6-and-10-10-yosemite">Cocoapods with Xcode 6 and 10.10 Yosemite</a> and in the issue(<a href="https://github.com/CocoaPods/CocoaPods/issues/2219" rel="nofollow">https://github.com/CocoaPods/CocoaPods/issues/2219</a>) closed due to the same solution proposed on the Stack Overflow link.</p>
  
  <p>I continue to get the following error:</p>
  
  <pre><code>Rasmuss-MacBook-Pro:~ rasmusth$ 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/2.0/usr/bin/ruby" -rubygems /Library/Ruby/Gems/2.0.0/gems/rake-0.9.6/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 &lt;main&gt;'
      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 `&lt;main&gt;'
  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 &lt;top (required)&gt;'
  Tasks: TOP =&gt; default =&gt; 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
  </code></pre>
  
  <p>I am suspecting that this may have to do with the fact that I have Yosemite on a separate partition, but otherwise I am clueless.</p>