在mac上安装一个python 3.7.0环境的时候，提示如下错误信息：
Anthonys-MacBook-Pro-2: anthony$ pyenv install -s 3.7.0
python-build: use openssl from homebrew
python-build: use readline from homebrew
Downloading Python-3.7.0.tar.xz...
-> https://www.python.org/ftp/python/3.7.0/Python-3.7.0.tar.xz
Installing Python-3.7.0...
python-build: use readline from homebrew
BUILD FAILED (OS X 10.14.2 using python-build 20180424)
Inspect or clean up the working tree at /var/folders/6g/6mxnqb850jvcdrgpg6zh7h200000gn/T/python-build.20190119102529.14304
Results logged to /var/folders/6g/6mxnqb850jvcdrgpg6zh7h200000gn/T/python-build.20190119102529.14304.log
Last 10 log lines:
checking for --enable-universalsdk... no
checking for --with-universal-archs... no
checking MACHDEP... checking for --without-gcc... no
checking for --with-icc... no
checking for gcc... clang
checking whether the C compiler works... no
configure: error: in `/var/folders/6g/6mxnqb850jvcdrgpg6zh7h200000gn/T/python-build.20190119102529.14304/Python-3.7.0':
configure: error: C compiler cannot create executables
See `config.log' for more details
xcrun: error: invalid active developer path (/Library/Developer/CommandLineTools), missing xcrun at: /Library/Developer/CommandLineTools/usr/bin/xcrun
Anthonys-MacBook-Pro-2: anthony$ xcode-select --install
xcode-select: note: install requested for command line developer tools
Anthonys-MacBook-Pro-2: anthony$
这个问题是 Xcode Command-line Tools 造成的，我们需要更新xcode。在终端窗口输入：
xcode-select --install
终端窗口并不会出现什么，mac会弹出一个窗口要你更新Xcode软件，点击更新，大概花几分钟下载安装更新，完了再次运行
pyenv install -s 3.7.0
本以为这次ok了，没想到再次出错：
Installing Python-3.7.0...
python-build: use readline from homebrew
BUILD FAILED (OS X 10.14.2 using python-build 20180424)
Inspect or clean up the working tree at /var/folders/6g/6mxnqb850jvcdrgpg6zh7h200000gn/T/python-build.20190119104429.78337
Results logged to /var/folders/6g/6mxnqb850jvcdrgpg6zh7h200000gn/T/python-build.20190119104429.78337.log
Last 10 log lines:
File "/private/var/folders/6g/6mxnqb850jvcdrgpg6zh7h200000gn/T/python-build.20190119104429.78337/Python-3.7.0/Lib/ensurepip/__main__.py", line 5, in <module>
sys.exit(ensurepip._main())
File "/private/var/folders/6g/6mxnqb850jvcdrgpg6zh7h200000gn/T/python-build.20190119104429.78337/Python-3.7.0/Lib/ensurepip/__init__.py", line 204, in _main
default_pip=args.default_pip,
File "/private/var/folders/6g/6mxnqb850jvcdrgpg6zh7h200000gn/T/python-build.20190119104429.78337/Python-3.7.0/Lib/ensurepip/__init__.py", line 117, in _bootstrap
return _run_pip(args + [p[0] for p in _PROJECTS], additional_paths)
File "/private/var/folders/6g/6mxnqb850jvcdrgpg6zh7h200000gn/T/python-build.20190119104429.78337/Python-3.7.0/Lib/ensurepip/__init__.py", line 27, in _run_pip
import pip._internal
zipimport.ZipImportError: can't decompress data; zlib not available
make: *** [install] Error 1
试图用"$ brew install zlib* " 安装zlib包来解决，但是安装完以后仍然是同样故障。
查了一些资料，发现需要使用
sudo installer -pkg /Library/Developer/CommandLineTools/Packages/macOS_SDK_headers_for_macOS_10.14.pkg -target /
再来：
Anthonys-MacBook-Pro-2: anthony$ sudo installer -pkg /Library/Developer/CommandLineTools/Packages/macOS_SDK_headers_for_macOS_10.14.pkg -target /
Password:
installer: Package name is macOS_SDK_headers_for_macOS_10.14
installer: Installing at base path /
installer: The install was successful.
Anthonys-MacBook-Pro-2: anthony$ pyenv install -s 3.7.0
python-build: use openssl from homebrew
python-build: use readline from homebrew
Installing Python-3.7.0...
python-build: use readline from homebrew
Installed Python-3.7.0 to /Users/anthony/.pyenv/versions/3.7.0
这次终于顺利完成安装。
