diff --git a/Makefile b/Makefile
index 023069c..5fd8928 100644
--- a/Makefile
+++ b/Makefile
@@ -2,7 +2,7 @@
 # This Makefile is used to manage development and distribution.
 #
 # Created: 2022-08-11
-# Updated: 2022-08-31
+# Updated: 2022-09-01
 #
 
 .PHONY: build create-venv help prebuild publish test test-all update-venv
@@ -64,7 +64,7 @@ dev-venv-create: dev-venv-base dev-venv-install
 
 dev-venv-install:
 	${VENV} pip install --upgrade pip setuptools wheel
-	${VENV} pip install --upgrade build sphinx tox twine typing-extensions
+	${VENV} pip install --upgrade build sphinx tomli tox twine typing-extensions
 	${VENV} pip install -e "${SRC_DIR}"
 
 
diff --git a/prebuild.py b/prebuild.py
index c42940c..2d009da 100644
--- a/prebuild.py
+++ b/prebuild.py
@@ -1,10 +1,14 @@
 """
-This script generates files required for source and wheel distributions.
+This script generates files required for source and wheel distributions,
+and legacy installations.
 """
 
 import argparse
+import configparser
 import sys
 
+import tomli
+
 
 def generate_readme_dist() -> None:
 	"""
@@ -25,6 +29,43 @@ def generate_readme_dist() -> None:
 		fh.write(output)
 
 
+def generate_setup_cfg() -> None:
+	"""
+	Generate the "setup.cfg" file from "pyproject.toml" in order to
+	support legacy installation with "setup.py".
+	"""
+	print("Read: pyproject.toml")
+	with open("pyproject.toml", 'rb') as fh:
+		config = tomli.load(fh)
+
+	print("Write: setup.cfg")
+	output = configparser.ConfigParser()
+	output['metadata'] = {
+		'author': config['project']['authors'][0]['name'],
+		'author_email': config['project']['authors'][0]['email'],
+		'classifiers': "\n" + "\n".join(config['project']['classifiers']),
+		'description': config['project']['description'],
+		'license': config['project']['license']['text'],
+		'long_description': f"file: {config['project']['readme']}",
+		'long_description_content_type': "text/x-rst",
+		'name': config['project']['name'],
+		'url': config['project']['urls']['Source Code'],
+		'version': f"attr: {config['tool']['setuptools']['dynamic']['version']['attr']}",
+	}
+	output['options'] = {
+		'packages': "find:",
+		'python_requires': config['project']['requires-python'],
+		'setup_requires': ", ".join(config['build-system']['requires']),
+		'test_suite': "tests",
+	}
+	output['bdist_wheel'] = {
+		'universal': "1",
+	}
+
+	with open("setup.cfg", 'w') as fh:
+		output.write(fh)
+
+
 def main() -> int:
 	"""
 	Run the script.
@@ -34,6 +75,7 @@ def main() -> int:
 	parser.parse_args(sys.argv[1:])
 
 	generate_readme_dist()
+	generate_setup_cfg()
 
 	return 0
 
diff --git a/setup.cfg b/setup.cfg
new file mode 100644
index 0000000..6b65c40
--- /dev/null
+++ b/setup.cfg
@@ -0,0 +1,36 @@
+[metadata]
+author = Caleb P. Burns
+author_email = cpburnz@gmail.com
+classifiers = 
+	Development Status :: 4 - Beta
+	Intended Audience :: Developers
+	License :: OSI Approved :: Mozilla Public License 2.0 (MPL 2.0)
+	Operating System :: OS Independent
+	Programming Language :: Python
+	Programming Language :: Python :: 3
+	Programming Language :: Python :: 3.7
+	Programming Language :: Python :: 3.8
+	Programming Language :: Python :: 3.9
+	Programming Language :: Python :: 3.10
+	Programming Language :: Python :: 3.11
+	Programming Language :: Python :: Implementation :: CPython
+	Programming Language :: Python :: Implementation :: PyPy
+	Topic :: Software Development :: Libraries :: Python Modules
+	Topic :: Utilities
+description = Utility library for gitignore style pattern matching of file paths.
+license = MPL 2.0
+long_description = file: README-dist.rst
+long_description_content_type = text/x-rst
+name = pathspec
+url = https://github.com/cpburnz/python-pathspec
+version = attr: pathspec._meta.__version__
+
+[options]
+packages = find:
+python_requires = >=3.7
+setup_requires = setuptools>=40.8.0
+test_suite = tests
+
+[bdist_wheel]
+universal = 1
+
diff --git a/setup.py b/setup.py
index b5e21ab..17788aa 100644
--- a/setup.py
+++ b/setup.py
@@ -1,17 +1,8 @@
 """
-This setup script only exists to support installations where pip cannot
-be used such as for system packages.
+This setup script only exists to support legacy installations where pip
+is cumbersome be used such as for system packages.
 """
 
-import setuptools
-import sys
+from setuptools import setup
 
-if int(setuptools.__version__.split(".")[0]) < 61:
-	sys.stderr.write((
-		"WARNING: Installed version of setuptools, {version}, is too old. "
-		"Version 61.0.0 is required for the pyproject.toml configuration "
-		"to load. This will most likely build and install as a packaged "
-		"named 'UNKNOWN'.\n"
-	).format(version=setuptools.__version__))
-
-setuptools.setup()
+setup()