Build currently broken due to pip / conda issue.

[mithro]

Preparing transaction: ...working... done
Verifying transaction: ...working... done
Executing transaction: ...working... done
Installing pip dependencies: ...working... Pip subprocess error:
ERROR: Exception:
Traceback (most recent call last):
  File "/tmpfs/src/github/ibex-yosys-build/env/conda/envs/xc7/lib/python3.8/site-packages/pip/_internal/cli/base_command.py", line 173, in _main
    status = self.run(options, args)
  File "/tmpfs/src/github/ibex-yosys-build/env/conda/envs/xc7/lib/python3.8/site-packages/pip/_internal/cli/req_command.py", line 203, in wrapper
    return func(self, options, args)
  File "/tmpfs/src/github/ibex-yosys-build/env/conda/envs/xc7/lib/python3.8/site-packages/pip/_internal/commands/install.py", line 286, in run
    reqs = self.get_requirements(args, options, finder, session)
  File "/tmpfs/src/github/ibex-yosys-build/env/conda/envs/xc7/lib/python3.8/site-packages/pip/_internal/cli/req_command.py", line 384, in get_requirements
    for parsed_req in parse_requirements(
  File "/tmpfs/src/github/ibex-yosys-build/env/conda/envs/xc7/lib/python3.8/site-packages/pip/_internal/req/req_file.py", line 135, in parse_requirements
    for parsed_line in parser.parse(filename, constraint):
  File "/tmpfs/src/github/ibex-yosys-build/env/conda/envs/xc7/lib/python3.8/site-packages/pip/_internal/req/req_file.py", line 319, in parse
    yield from self._parse_and_recurse(filename, constraint)
  File "/tmpfs/src/github/ibex-yosys-build/env/conda/envs/xc7/lib/python3.8/site-packages/pip/_internal/req/req_file.py", line 348, in _parse_and_recurse
    yield from self._parse_and_recurse(req_path, nested_constraint)
  File "/tmpfs/src/github/ibex-yosys-build/env/conda/envs/xc7/lib/python3.8/site-packages/pip/_internal/req/req_file.py", line 324, in _parse_and_recurse
    for line in self._parse_file(filename, constraint):
  File "/tmpfs/src/github/ibex-yosys-build/env/conda/envs/xc7/lib/python3.8/site-packages/pip/_internal/req/req_file.py", line 353, in _parse_file
    _, content = get_file_content(filename, self._session)
  File "/tmpfs/src/github/ibex-yosys-build/env/conda/envs/xc7/lib/python3.8/site-packages/pip/_internal/req/req_file.py", line 518, in get_file_content
    resp = session.get(url)
  File "/tmpfs/src/github/ibex-yosys-build/env/conda/envs/xc7/lib/python3.8/site-packages/pip/_vendor/requests/sessions.py", line 555, in get
    return self.request('GET', url, **kwargs)
  File "/tmpfs/src/github/ibex-yosys-build/env/conda/envs/xc7/lib/python3.8/site-packages/pip/_internal/network/session.py", line 454, in request
    return super().request(method, url, *args, **kwargs)
  File "/tmpfs/src/github/ibex-yosys-build/env/conda/envs/xc7/lib/python3.8/site-packages/pip/_vendor/requests/sessions.py", line 542, in request
    resp = self.send(prep, **send_kwargs)
  File "/tmpfs/src/github/ibex-yosys-build/env/conda/envs/xc7/lib/python3.8/site-packages/pip/_vendor/requests/sessions.py", line 697, in send
    r.content
  File "/tmpfs/src/github/ibex-yosys-build/env/conda/envs/xc7/lib/python3.8/site-packages/pip/_vendor/requests/models.py", line 836, in content
    self._content = b''.join(self.iter_content(CONTENT_CHUNK_SIZE)) or b''
  File "/tmpfs/src/github/ibex-yosys-build/env/conda/envs/xc7/lib/python3.8/site-packages/pip/_vendor/requests/models.py", line 769, in generate
    chunk = self.raw.read(chunk_size)
AttributeError: 'FileNotFoundError' object has no attribute 'read'

Ran pip subprocess with arguments:
['/tmpfs/src/github/ibex-yosys-build/env/conda/envs/xc7/bin/python', '-m', 'pip', 'install', '-U', '-r', '/tmpfs/src/github/ibex-yosys-build/condaenv.o2j6_bfy.requirements.txt']
Pip subprocess output:

failed

CondaEnvException: Pip failed

third_party/make-env/conda.mk:145: recipe for target '/tmpfs/src/github/ibex-yosys-build/env/conda/envs/xc7/bin/python' failed
make: *** [/tmpfs/src/github/ibex-yosys-build/env/conda/envs/xc7/bin/python] Error 1