Why Does `pip install psycopg2` Fail with \'unknown argument: \'-mno-fused-madd\'\' on OS X?

clang error: unknown argument: '-mno-fused-madd' while installing psycopg2

This error occurs when attempting to install psycopg2 via pip on Mavericks 10.9. It results from an unknown argument, '-mno-fused-madd', passed to the clang compiler.

Resolution:

To resolve this issue, modify the environment variables before compilation by setting the following:

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

Additional Considerations for Superuser Installation:

If the installation is performed as a superuser, add the following prefix to the pip command:

sudo -E pip install psycopg2

OSX Updates and Workaround Validity:

This workaround was necessary for OS X 10.8.x and Xcode 5.1 . However, as of OS X 10.9.3, Apple has fixed this issue for system Pythons (2.7, 2.6, and 2.5). Therefore, the workaround is no longer required for the latest Mavericks and Xcode 5.1 versions.

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