Build failure due to setuptools in pyproject.toml

It looks like https://github.com/pytest-dev/pytest-forked/blob/master/pyproject.toml is causing build failures due to setuptools ~= 41.4 (console output below). This has been seen in other packages as well. A possible solution is to get rid of the file, or at least the setuptools pin.

10:13:52 Collecting  #pytest-forked
10:13:52   Downloading pytest-forked-1.3.0.tar.gz (9.8 kB)
10:13:52   Installing build dependencies: started
10:13:53   Installing build dependencies: finished with status 'error'
10:13:53   ERROR: Command errored out with exit status 1:
10:13:53    command: /usr/local/bin/python /usr/local/lib/python3.7/site-packages/pip install --ignore-installed --no-user --prefix /tmp/pip-build-env-hbrecn75/overlay --no-warn-script-location --no-binary :all: --only-binary :none: -i http://build.locusdev.net:10001/simple --extra-index-url https://pypi.python.org/simple --trusted-host build.locusdev.net -- 'setuptools ~= 41.4' 'setuptools_scm ~= 3.3' 'wheel ~= 0.33.6'
10:13:53        cwd: None
10:13:53   Complete output (20 lines):
10:13:53   Looking in indexes: http://build.locusdev.net:10001/simple, https://pypi.python.org/simple/, https://pypi.python.org/simple
10:13:53   Collecting setuptools~=41.4
10:13:53     Downloading setuptools-41.6.0.zip (852 kB)
10:13:53       ERROR: Command errored out with exit status 1:
10:13:53        command: /usr/local/bin/python -c 'import sys, setuptools, tokenize; sys.argv[0] = '"'"'/tmp/pip-install-fobv7n3k/setuptools/setup.py'"'"'; __file__='"'"'/tmp/pip-install-fobv7n3k/setuptools/setup.py'"'"';f=getattr(tokenize, '"'"'open'"'"', open)(__file__);code=f.read().replace('"'"'\r\n'"'"', '"'"'\n'"'"');f.close();exec(compile(code, __file__, '"'"'exec'"'"'))' egg_info --egg-base /tmp/pip-install-fobv7n3k/setuptools/pip-egg-info
10:13:53            cwd: /tmp/pip-install-fobv7n3k/setuptools/
10:13:53       Complete output (9 lines):
10:13:53       Traceback (most recent call last):
10:13:53         File "<string>", line 1, in <module>
10:13:53         File "/tmp/pip-install-fobv7n3k/setuptools/setuptools/__init__.py", line 6, in <module>
10:13:53           import distutils.core
10:13:53         File "/usr/local/lib/python3.7/site-packages/_distutils_hack/__init__.py", line 83, in create_module
10:13:53           return importlib.import_module('setuptools._distutils')
10:13:53         File "/usr/local/lib/python3.7/importlib/__init__.py", line 127, in import_module
10:13:53           return _bootstrap._gcd_import(name[level:], package, level)
10:13:53       ModuleNotFoundError: No module named 'setuptools._distutils'
10:13:53       ----------------------------------------
10:13:53   ERROR: Command errored out with exit status 1: python setup.py egg_info Check the logs for full command output.
10:13:53   WARNING: You are using pip version 20.0.2; however, version 20.2.2 is available.
10:13:53   You should consider upgrading via the '/usr/local/bin/python -m pip install --upgrade pip' command.
10:13:53   ----------------------------------------
10:13:53 ERROR: Command errored out with exit status 1: /usr/local/bin/python /usr/local/lib/python3.7/site-packages/pip install --ignore-installed --no-user --prefix /tmp/pip-build-env-hbrecn75/overlay --no-warn-script-location --no-binary :all: --only-binary :none: -i http://build.locusdev.net:10001/simple --extra-index-url https://pypi.python.org/simple --trusted-host build.locusdev.net -- 'setuptools ~= 41.4' 'setuptools_scm ~= 3.3' 'wheel ~= 0.33.6' Check the logs for full command output.
10:13:53 WARNING: You are using pip version 20.0.2; however, version 20.2.2 is available.
10:13:53 You should consider upgrading via the '/usr/local/bin/python -m pip install --upgrade pip' command.

Start by inspecting pyproject.toml and reproducing the reported source-distribution build with the pip and Python versions shown in the issue. Compare the setuptools requirement with the linked setuptools issue and verify that the package can install its build dependencies and complete the build without the reported ModuleNotFoundError.