Setup requirements not consistent

[kubinski]

I tried downloading pynacl and all the requirements with pip3 download which downloaded the following packages: pynacl, six, cffi, and pycparser (required from cffi).
However if I bundled these packages and moved to a machine that did not have internet access and tried to install (via pip3 install --no-index -f <package_dir> pynacl) from the local wheels it will fail because the install requires a different set of packages: setuptools, wheel, and cffi.
I am assuming from the comment in the pyproject.toml that the issue is the setup_requirements in setup.py don't match (they are empty in setup.py).
I also think it is strange that the pip install command is passing the --ignore-installed flag because I already do have setuptools and wheel installed but it is still trying to find the packages which it can't when not connected to the internet.

[lmctv]

six and cffi are direct requirements of pynacl; without some information on both the build and the deploy target environments and possibly the exception backtrace we are unable to understand wha't happening.

[lmctv]

@kubinski could you please retry your deployment, to confirm #485 really solves this issue?