PyMC V4 install issue: WARNING (Using NumPy C-API based implementation for BLAS functions

[CameronBieganek]

Possible solution described here:

WARNING: g++ not detected

I managed to accidentally resolve this issue. I recently updated my operating system from an old version of macOS to the new macOS Monterrey. I was occasionally getting what seemed like an unrelated error when using the terminal (not the python REPL): xcrun: error: invalid active developer path (/Library/Developer/CommandLineTools), missing xcrun at: /Library/Developer/CommandLineTools/usr/bin/xcrun I was able to resolve that by running xcode-select --install in the terminal, as described in t…

In short, you might need to install/re-install xcode-select via the following terminal command:

xcode-select --install