Install Pillow with pip on OS X Mavericks 10.9.1

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I recently ran into an issue on Mavericks where installing the python package Pillow would not install correctly and error out on my, referencing a clang error that I was in no mood to debug.

clang: error: unknown argument: '-mno-fused-madd' [-Wunused-command-line-argument-hard-error-in-future]

I Googled a solution for about 20 minutes until I found this: before running pip install, run this

export CFLAGS=-Qunused-arguments
export CPPFLAGS=-Qunused-arguments

Update: I’ve noticed as of version 5.1.0.0.1.1396320587 of XCode Command Line Tools, the above temp-fix doesn’t seem to work is you’re using sudo to install a package. To use sudo, make sure you append the -E flag

sudo -E pip install PACKAGE

Sources:

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