How do I fix: Method 2: Use pip with --no-binary?

Step 1: Run the command `pip install psycopg2 --no-binary :all:` to disable binary installation and use a pre-built wheel instead.

Software⏱️ 2 min read📅 2026-05-31

How to Fix: clang error: unknown argument: '-mno-fused-madd' (python package installation failure)

Step 1: Open the Terminal and run the command `sudo homebrew install clang --build-from-source` to update your system's clang compiler.

Learn how to fix: clang error: unknown argument: '-mno-fused-madd' (python package installation failure).

Quick Answer: Try checking your system settings or restarting.

📋 Table of Contents

To resolve the 'unknown argument: -mno-fused-madd' error when installing psycopg2 on Mavericks 10.9, you need to update your system's clang compiler.

Step 1: Open the Terminal and run the command `sudo homebrew install clang --build-from-source` to update your system's clang compiler.

Step 1: Run the command `pip install psycopg2 --no-binary :all:` to disable binary installation and use a pre-built wheel instead.

By following these steps, you should be able to successfully install psycopg2 on your Mavericks 10.9 system.

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