This is coming from Homebrew (https://github.com/Homebrew/brew/pull/1384) which is used by several packages to manage binary dependencies on mac.
On Sunday, October 30, 2016 at 9:30:46 AM UTC-7, dayc...@icloud.com wrote: > > So I got back from a week away from the computer, and Julia's suddenly not > working on my Mac (it's mainly due to Cairo.jl, I think), and when I try to > rebuild it it appears to be that my version of Xcode is out of date: > > Error: Your Xcode (8.0) is outdated. > Please update to Xcode 8.1 (or delete it). > Xcode can be updated from the App Store. > > Which is fine.... > > But, Xcode 8.1 was released on Thursday 27th (related to this week's Apple > Event I suppose). That's only a couple of days ago! I like the > responsiveness (I think) and we're all used to living on the bleeding edge, > but it's still surprising that this happened so quickly, and that there's > no notice or anything anywhere, that I could see, that Julia installations > would be broken immediately they released a new version of Xcode. > > Was I the only one affected !? > >