根据 Medium 上这篇文章的分享,用下面的指令可以安装成功。
https://medium.com/@pimterry/setting-up-pyenv-on-os-x-with-homebrew-56c7541fd331
CFLAGS="-I$(brew --prefix readline)/include -I$(brew --prefix openssl)/include -I$(xcrun --show-sdk-path)/usr/include" \
LDFLAGS="-L$(brew --prefix readline)/lib -L$(brew --prefix openssl)/lib" \
PYTHON_CONFIGURE_OPTS=--enable-unicode=ucs2 \
pyenv install 3.6.8