How to Fix the `-mno-fused-madd` Error During psycopg2 Installation on macOS?

Error Encountered During psycopg2 Installation

Attempting to install psycopg2 using pip on Mavericks 10.9 results in the following error:

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

Addressing the Error

To resolve this error, suppress the 'mno-fused-madd' warning by setting the environment variables before compiling:

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

Subsequently, running the installation command should proceed successfully.

Additional Considerations

• When installing as a superuser, use sudo -E to avoid permission issues.
• In OS X 10.9.3, the issue has been resolved for the updated system Pythons.
• If using Mountain Lion (10.8.x) with Xcode 5.1 , the workaround is still required.

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