是什么原因导致pip安装cryptacular在“SCON”失败？

Question

Debian10，在Python3.7VENV中（不是sudo）

从pip需求文件进行的安装在cryptacular失败，因此经过一天的阅读后，我手动安装了pip wheel，然后ENSV站点包中包含了enscons so enscons-0.25.0和SCons-4.0.1，但是pip install cryptacular仍然会引发以下问题：

 Failed building wheel for cryptacular
  Running setup.py clean for cryptacular
Failed to build cryptacular
Installing collected packages: cryptacular
  Running setup.py install for cryptacular ... error
    Complete output from command /home/saves/savespy3/bin/python3 -u -c "import setuptools, tokenize;__file__='/tmp/pip-install-jru69lmn/cryptacular/setup.py';f=getattr(tokenize, 'open', open)(__file__);code=f.read().replace('\r\n', '\n');f.close();exec(compile(code, __file__, 'exec'))" install --record /tmp/pip-record-v8w0pkm2/install-record.txt --single-version-externally-managed --compile --install-headers /home/saves/savespy3/include/site/python3.7/cryptacular:
    scons: Reading SConscript files ...
    scons: done reading SConscript files.
    scons: Building targets ...
    scons: *** Do not know how to make File target `install' (/tmp/pip-install-jru69lmn/cryptacular/install).  Stop.
    scons: building terminated because of errors.

显然，这是个问题吗