Error installing on Mac OSX (Mavericks) using pip
clang: error: unknown argument: '-mno-fused-madd' [-Wunused-command-line-argument-hard-error-in-future]
Tell clang not to raise these errors:
export CFLAGS=-Qunused-arguments
export CPPFLAGS=-Qunused-arguments
Use -E to pick up changes as the root user
sudo -E pip install rpy2