Heads-up, anyone who keeps their Mac software up-to-date

[David DeHaven]

> XCode 5 changed things a little:
> 
> configure: The C compiler (located as /usr/bin/gcc) does not seem to be the required GCC compiler.
> configure: The result from running with --version was: "Configured with: --prefix=/Applications/Xcode.app/Contents/Developer/usr --with-gxx-include-dir=/usr/include/c++/4.2.1"

Yep, GCC-LLVM is no longer bundled with Xcode as of version 5. You can rename the old Xcode version and run it side-by-side, though I've noticed the Xcode 5 command line tools interfered with Xcode 4.6's during the developer preview, you may have to reinstall the older CL tools or maybe Apple fixed it (doubtful...).

To switch between Xcode versions, use xcode-select. This will update all the symlinks and whatnot so the command line tools run from the selected location.

Example:
$ xcode-select -switch /Applications/Xcode\ 4.6.app

-DrD-