Error building with pip

Attempting to build with pip generates the following error. I have installed ghostscript and MS Visual C++ tools as mentioned in the output.

```
Building wheels for collected packages: pycrypto
Building wheel for pycrypto (pyproject.toml) ... error
error: subprocess-exited-with-error

× Building wheel for pycrypto (pyproject.toml) did not run successfully.
│ exit code: 1
╰─> [15 lines of output]
C:\Users\username\AppData\Local\Temp\pip-build-env-p29hjsty\overlay\Lib\site-packages\setuptools\dist.py:765: SetuptoolsDeprecationWarning: License classifiers are deprecated.
!!

********************************************************************************
Please consider removing the following classifiers in favor of a SPDX license expression:

License :: Public Domain

See https://packaging.python.org/en/latest/guides/writing-pyproject-toml/#license for details.
********************************************************************************

!!
self._finalize_license_expression()
warning: GMP or MPIR library not found; Not building Crypto.PublicKey._fastmath.
error: Microsoft Visual C++ 14.0 or greater is required. Get it with "Microsoft C++ Build Tools": https://visualstudio.microsoft.com/visual-cpp-build-tools/
[end of output]

note: This error originates from a subprocess, and is likely not a problem with pip.
ERROR: Failed building wheel for pycrypto
Failed to build pycrypto
error: failed-wheel-build-for-install

× Failed to build installable wheels for some pyproject.toml based projects
╰─> pycrypto
```

Reproduce the Windows installation with pip and review the pyproject.toml build configuration referenced in the error. Check how the pycrypto dependency is selected and whether the documented installation path covers the reported compiler requirement; done means the package installs successfully without the failed-wheel error.

Written by the indexing model from the issue text.