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The answers to this stackoverflow question have a lot of suggestions on how to circumvent the problem. It is caused by a change in the latest clang version shipped with that a recent update from apple defaulting to fail on unused arguments: http://stackoverflow.com/questions/22313407/clang-error-unknown-argument-mno-fused-madd-python-package-installation-fa

The answers to this stackoverflow question have a lot of suggestions on how to circumvent the problem. It is caused by a change in the latest clang version shipped with that a recent update from apple defaulting to fail on unused arguments: http://stackoverflow.com/questions/22313407/clang-error-unknown-argument-mno-fused-madd-python-package-installation-fa

EDIT:

TL;DR: One way is:

export CFLAGS=-Qunused-arguments
export CPPFLAGS=-Qunused-arguments
sudo -E pip install ...