help needed: Updating pyqt to 4.11.1

Unfortunately this fails to compile (on Mavericks) with the following linker error: http://pastebin.com/rWmepPhu

Possibly this is related to Homebrew building with the custom libc++ makespec.

Any ideas?
Use a Ruby `FileUtils` method rather than shelling out here. Also, you don't need do specify the `FileUtils.` as it's included as a module into `Formula`.