Carthage/Carthage — pull request #245 by 0xced (2014-12-25 00:32:05+00:00)
Title: Check minimum required Xcode version

I added a simple run script phase that checks the minimum required Xcode version (currently 6.1.1). It aborts with a clear error if the condition is not met: `Xcode 6.1.1 or later is required to build carthage`

This should fix #152.