Couldn\'t find an answer to this. Running OS X Yosemite Beta v2
When following compass install guide ensure that your gem is up-to-date
gem update --sy
Got the same issue, also used xcode-select --install but not help. I have to download correct dmg from here https://developer.apple.com/downloads/?name=for%20Xcode
xcode-select --install
https://developer.apple.com/downloads/?name=for%20Xcode