错误:没办法为使用PEP 517且没办法直接安装的密码术制造轮子

当pip为加密软件包构建轮子时，我得到了一个错误.

I get an error when pip builds wheels for the cryptography package.

错误:

LINK : fatal error LNK1181: cannot open input file 'libssl.lib'
  error: command 'C:\\Program Files (x86)\\Microsoft Visual Studio\\2017\\BuildTools\\VC\\Tools\\MSVC\\14.16.27023\\bin\\HostX86\\x86\\link.exe' failed with exit status 1181
  ----------------------------------------
  ERROR: Failed building wheel for cryptography
  Running setup.py clean for cryptography
Failed to build cryptography
ERROR: Could not build wheels for cryptography which use PEP 517 and cannot be installed directly

I have already installed OpenSSL and set the environment variables as suggested in this post yet the problem persists. My setup details:

• 系统-Windows 10
• Python-3.8
• 点-19.3.1