Cannot pip install orjson (python 3.6).

sudo pip3 install --upgrade orjson:

Complete output from command python setup.py egg_info:
    Traceback (most recent call last):
      File "<string>", line 1, in <module>
      File "/usr/lib/python3.6/tokenize.py", line 452, in open
        buffer = _builtin_open(filename, 'rb')
    FileNotFoundError: [Errno 2] No such file or directory: '/tmp/pip-build-3dwbn4b3/orjson/setup.py'

Not sure why it can’t find setup when it was just downloaded. I’ve verified that it exists in the source.