Error installing smbus2 on pocketbeagle

I am trying to install smbus2-0.2.1 on a Pocketbeagle running Debian v9.5. While I do not have an internet connection, I’ve utilized WinSCP to get the appropriate wheels and tar files over to the beagle to install pip v18.1 and setuptools v40.6.3. However, upon trying to install smbus2-0.2.1, I get the following error:

debian@beaglebone:/var/lib/cloud9$ pip install smbus2-0.2.1.tar
Processing ./smbus2-0.2.1.tar
Complete output from command python setup.py egg_info:
error in smbus2 setup command: ‘extras_require’ must be a dictionary whose values are strings or lists of strings containing valid project/version requirement specifiers.

Command “python setup.py egg_info” failed with error code 1 in /tmp/pip-req-build-f0O3p9/

Per a previous bug report (https://github.com/kplindegaard/smbus2/issues/21), I tried untarring smbus2-0.2.1 and commenting out the “extras_require” lines. Upon running setup.py, I got the following:

debian@beaglebone:/var/lib/cloud9/smbus2-0.2.1$ python setup.py
Traceback (most recent call last):
File “setup.py”, line 63, in
“Programming Language :: Python :: 3.6”
File “/usr/lib/python2.7/distutils/core.py”, line 111, in setup
_setup_distribution = dist = klass(attrs)
File “/usr/local/lib/python2.7/dist-packages/distribute-0.6.45-py2.7.egg/setuptools/dist.py”, line 225, in init
_Distribution.init(self,attrs)
File “/usr/lib/python2.7/distutils/dist.py”, line 287, in init
self.finalize_options()
File “/usr/local/lib/python2.7/dist-packages/distribute-0.6.45-py2.7.egg/setuptools/dist.py”, line 257, in finalize_options
ep.require(installer=self.fetch_build_egg)
File “/usr/local/lib/python2.7/dist-packages/distribute-0.6.45-py2.7.egg/pkg_resources.py”, line 2072, in require
working_set.resolve(self.dist.requires(self.extras),env,installer))
File “/usr/local/lib/python2.7/dist-packages/distribute-0.6.45-py2.7.egg/pkg_resources.py”, line 2282, in requires
dm = self._dep_map
File “/usr/local/lib/python2.7/dist-packages/distribute-0.6.45-py2.7.egg/pkg_resources.py”, line 2511, in _dep_map
self.__dep_map = self._compute_dependencies()
File “/usr/local/lib/python2.7/dist-packages/distribute-0.6.45-py2.7.egg/pkg_resources.py”, line 2544, in _compute_dependencies
common = frozenset(reqs_for_extra(None))
File “/usr/local/lib/python2.7/dist-packages/distribute-0.6.45-py2.7.egg/pkg_resources.py”, line 2541, in reqs_for_extra
if req.marker_fn(override={‘extra’:extra}):
File “/usr/local/lib/python2.7/dist-packages/distribute-0.6.45-py2.7.egg/_markerlib/markers.py”, line 109, in marker_fn
return eval(compiled_marker, environment)
File “”, line 1, in
NameError: name ‘sys_platform’ is not defined

I’m not sure where to go at this point. Previous solutions were based on upgrading the version of setuptools that was available, but I have the most up-to-date version, so that’s out. Any thoughts?