Rails: Python2 error on yarn install

I recently worked on a legacy codebase that requires Python2, which has been deprecated for some time and is no longer available via homebrew.

Using this Stack Overflow thread I was able to resolve the issue as below. Note that the “pyenv global” command might interfere with with your Python3 environment.

The Error

➜ yarn install --check-files
gyp verb command configure []
gyp verb check python checking for Python executable "python2" in the PATH
gyp verb `which` failed Error: not found: python2

➜ which python
python not found

➜ which python2
python2 not found

The Fix

➜ brew install pyenv
➜ pyenv install 2.7.18
➜ pyenv global 2.7.18
➜ PATH=$(pyenv root)/shims:$PATH
➜ which python2
/Users/user/.pyenv/shims/python2

➜ yarn install --check-files
yarn install v1.22.19
...
Done in 10.26s

Add to ~/.bashrc or ~/.zshrc to make available in future shell sessions:

# make python exe available globally
PATH=$(pyenv root)/shims:$PATH

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