Friends - I've developed a simple shell script that should enable your existing GHC 7. or HP installation work with Xcode 5. https://gist.github.com/mzero/7245290 Place that script somewhere, make it executable, and run it. *Then follow the instructions it tells you!* You will end up having to run it more than once: First time it will tell you where to install a copy of the script Second time it will patch your GHC settings file(s) The script is safe to install and setup before you upgrade to Xcode 5, as it reverts to "getting out of the way" if it detects Xcode 4 based installation. It has been tested on two machines: - OS X 10.8 and Xcode 4 - OS X 10.9 and Xcode 5 If a few more intrepid souls test it and it works, I'll post instructions in more prominent places! I'll be testing OS X 10.9 and Xcode 4, tomorrow, and expect it should work fine on OS X10.8 with Xcode 5. But looking for reports that it all works. - Mark "Mac Packager" Lentczner