Can't Install Python 3.10.0 With Pyenv On MacOS

Trying to install Python 3.10.0 on MacOS 11.6 (Intel) with pyenv 2.1.0 (from homebrew) fails with: python-build: use openssl@1.1 from homebrew python-build: use readline from homeb

Solution 1:

The problem was that I had a second version of clang installed (via homebrew), which interfered with the build. After running brew uninstall llvm pyenv/python-build picked the clang from xcode and now pyenv works again.

Solution 2:

Try env ARCHFLAGS="-arch x86_64"

(that works for me for other Python-related tools, I don't use pyenv myself).

Rationale: modern macOS supports 2 architectures: intel (x86_64) and m1 (arm-something). Compiling for only one architecture is easier.

Solution 3:

Sorry, still no idea why, but I just tried and it's working for me (terminal output below). I'm running Mac OS Big Sur, version 11.5.2 with an Intel i7 processor. My pyenv version is also the latest (2.1.0)

$ pyenv install 3.10.0
python-build: use openssl@1.1 from homebrew
python-build: use readline from homebrew
Downloading Python-3.10.0.tar.xz...
-> https://www.python.org/ftp/python/3.10.0/Python-3.10.0.tar.xz
Installing Python-3.10.0...
python-build: use tcl-tk from homebrew
python-build: use readline from homebrew
python-build: use zlib from xcode sdk
Installed Python-3.10.0 to /Users/myuser/.pyenv/versions/3.10.0

Before this I did:

brew update && brew upgrade pyenv

Solution 4:

I had a similar issue, which was resolved by setting the $CC environment variable to clang.

Solution 5:

Try this:

sudo rm -rf /Library/Developer/CommandLineTools
sudo xcode-select --install

It worked for me!

Reference: https://stackoverflow.com/a/66522514/6319240