PyEnv BUILD FAILED installing Python on MacOS

Question

While trying to install Python 3.6.6 (for Airflow) using PyEnv on MacOS, I am encountering build failure

Answer 1

This worked for me:

1. remove CommandLineTools folder under /Library/Developer
2. run in terminal: xcode-select --install
3. sudo mv /usr/local/include /usr/local/include_old

Answer 2

In my case this was caused by migration of data from old to new Mac. Both Xcode Command Line Tools and Homebrew migrated, but something broke. Reinstalling them from scratch worked for me.

Reinstall CLI tools:

$ sudo rm -rf /Library/Developer/CommandLineTools

$ xcode-select --install

Reinstall and update Homebrew:

ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/uninstall)"

ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)"

brew update

Istall pyenv + packages and python 3:

brew install pyenv
brew install openssl readline sqlite3 xz zlib
pyenv install 3.7.5