Hombrew is asking me for a version of Xcode the OS doesnt support I need to download certain apps through homebrew, one of them being pygtk, but when putting the rather simple command that should install it homebrew says my Xcode (6.4 because I am on Yosemite) is outdated and that need the 7.2.1 which I can't install because it's not supported in Yosemite. How can I fix this?
This may mean that you can't install pygtk through homebrew on Yosemite. You may still be able to compile from source, even with your version of Xcode.