If you've installed the OS X Mavericks Beta and you're having ruby issues like this:
/System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/rubygems.rb:777:in `report_activate_error': Could not find RubyGem jekyll (>= 0) (Gem::LoadError)
from /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/rubygems.rb:211:in `activate'
from /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/rubygems.rb:1056:in `gem'
from /usr/bin/jekyll:22
or
ERROR: Error installing cocoapods:
ERROR: Failed to build gem native extension.
/System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/bin/ruby extconf.rb
mkmf.rb can't find header files for ruby at /System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/lib/ruby/include/ruby.h
Gem files will remain installed in /Library/Ruby/Gems/2.0.0/gems/xcodeproj-0.6.0 for inspection.
Results logged to /Library/Ruby/Gems/2.0.0/gems/xcodeproj-0.6.0/ext/xcodeproj/gem_make.out
You'll want to run this script (from https://gist.github.com/goshakkk/5763489):
sys_rb_usr=/System/Library/Frameworks/Ruby.framework/Versions/2.0/usr
sdk_rb_usr=`xcode-select -p`/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.9.sdk/System/Library/Frameworks/Ruby.framework/Versions/2.0/usr
sudo cp -r $sdk_rb_usr/include $sys_rb_usr/include
Things moved around when you installed the beta so this fixes them up.
via (https://github.com/CocoaPods/CocoaPods/issues/1108)
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