关于Mac OS 11.0.1下pyenv下载python可能碰到的问题及解决

问题

环境

• 系统环境：Mac OS 11.0.1
• pyenv 1.2.20

下载指令

pyenv install 3.6.8

报错内容

Error in installing Python on MacOS and pyenv
`BUILD FAILED (OS X 11.0.1 using python-build 20180424)

Inspect or clean up the working tree at /tmp/python-build.20201120091233.71993
Results logged to /tmp/python-build.20201120091233.71993.log

Last 10 log lines:
./Modules/posixmodule.c:8210:15: error: implicit declaration of function 'sendfile' is invalid in C99 [-Werror,-Wimplicit-function-declaration]
ret = sendfile(in, out, offset, &sbytes, &sf, flags);
^
./Modules/posixmodule.c:10432:5: warning: code will never be executed [-Wunreachable-code]
Py_FatalError("abort() called from Python code didn't abort!");
^~~~~~~~~~~~~
1 warning and 1 error generated.
make: *** [Modules/posixmodule.o] Error 1
make: *** Waiting for unfinished jobs....
1 warning generated`

解决

一、进入XCode的Preference > Locations，将command-line tools选择适当的版本

二、运行以下指令
（注本文下载的python版本为3.6.8，如需要下载的为其他版本，则在相应位置更改版本号即可）

CFLAGS="-I$(brew --prefix openssl)/include -I$(brew --prefix bzip2)/include -I$(brew --prefix readline)/include -I$(xcrun --show-sdk-path)/usr/include" LDFLAGS="-L$(brew --prefix openssl)/lib -L$(brew --prefix readline)/lib -L$(brew --prefix zlib)/lib -L$(brew --prefix bzip2)/lib" pyenv install --patch 3.6.8 < <(curl -sSL https://github.com/python/cpython/commit/8ea6353.patch\?full_index\=1)

可看到这次不会报错，可以下载成功了

检验

pyenv versions

查看可知python 3.6.8已下载成功