http://warrenmar.wordpress.com/2014/04/02/ipython-2-0-0-osx-mavericks/
export CFLAGS=-Qunused-arguments export CPPFLAGS=-Qunused-arguments export ARCHFLAGS=-Wno-error=unused-command-line-argument-hard-error-in-future sudo -E pip install -U --force-reinstall ipython