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Why Does `pip install psycopg2` Fail with \'unknown argument: \'-mno-fused-madd\'\' on OS X?
- DDDOriginal
- 2024-11-25 10:53:11228browse
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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