Most of https://github.com/clarkbox/check_multiple/pull/2, without the
version bump or changed to README.md. Waited as long as I could, but
we need this for python-3.14.

diff --git a/bin/check_multiple b/bin/check_multiple
deleted file mode 100755
index e43a800..0000000
--- a/bin/check_multiple
+++ /dev/null
@@ -1,30 +0,0 @@
-#!/usr/bin/python3
-import argparse
-import sys
-
-from check_multiple.check_multiple import (MODE_BEST,
-                                           MODE_WORST,
-                                           process_results,
-                                           run_commands)
-
-
-parser = argparse.ArgumentParser(
-    description='Run multiple Nagios checks and combine the results.')
-parser.add_argument(
-    "--mode",
-    default='worst',
-    choices=['worst', 'best'],
-    help="which individual check result should be the overall result; "
-         "either the \"worst\" one or the \"best\" one (default: worst)")
-parser.add_argument(
-    "command",
-    nargs="+",
-    help="check to run, enclosed in quotes")
-
-args = parser.parse_args()
-mode = MODE_WORST
-if args.mode == "best":
-    mode = MODE_BEST
-exitcode,output = process_results(run_commands(args.command), mode)
-print(output)
-sys.exit(exitcode)
diff --git a/lib/check_multiple/__main__.py b/lib/check_multiple/__main__.py
new file mode 100644
index 0000000..f2ae908
--- /dev/null
+++ b/lib/check_multiple/__main__.py
@@ -0,0 +1,40 @@
+import sys
+
+def main():
+    import argparse
+
+    from check_multiple.check_multiple import (
+        MODE_BEST,
+        MODE_WORST,
+        process_results,
+        run_commands
+    )
+
+
+    parser = argparse.ArgumentParser(
+        description='Run multiple Nagios checks and combine the results.'
+    )
+    parser.add_argument(
+        "--mode",
+        default='worst',
+        choices=['worst', 'best'],
+        help="which individual check result should be the overall result; "
+             "either the \"worst\" one or the \"best\" one (default: worst)"
+    )
+    parser.add_argument(
+        "command",
+        nargs="+",
+        help="check to run, enclosed in quotes"
+    )
+
+    args = parser.parse_args()
+    mode = MODE_WORST
+    if args.mode == "best":
+        mode = MODE_BEST
+    exitcode,output = process_results(run_commands(args.command), mode)
+    print(output)
+    return exitcode
+
+
+if __name__ == '__main__':
+    sys.exit(main())
diff --git a/lib/check_multiple/check_multiple.py b/lib/check_multiple/check_multiple.py
index 7670690..e27401e 100644
--- a/lib/check_multiple/check_multiple.py
+++ b/lib/check_multiple/check_multiple.py
@@ -55,15 +55,7 @@ def run_command(c):
 
     Returns a single CompletedProcess instance.
     """
-    # The "capture_output=True" keyword argument that we would like to
-    # pass to run() doesn't exist before python-3.7. Likewise, the
-    # "universal_newlines" argument has been renamed to "text", but
-    # only in python 3.7.
-    return subprocess.run(c,
-                          shell=True,
-                          stdout=subprocess.PIPE,
-                          stderr=subprocess.PIPE,
-                          universal_newlines=True)
+    return subprocess.run(c, shell=True, capture_output=True, text=True)
 
 
 def run_commands(command_list):
diff --git a/pyproject.toml b/pyproject.toml
new file mode 100644
index 0000000..a6d4d0b
--- /dev/null
+++ b/pyproject.toml
@@ -0,0 +1,30 @@
+[build-system]
+requires = ["setuptools >= 61.0"]
+build-backend = "setuptools.build_meta"
+
+[project]
+name = "nagios-check_multiple"
+version = "0.0.1"
+description = "Run multiple Nagios checks and combine the results"
+requires-python = ">=3.9"
+license = "MIT"
+classifiers  = [
+  'Environment :: Console',
+  'Intended Audience :: System Administrators'
+]
+
+[project.readme]
+content-type = "text/markdown"
+file = "README.md"
+
+[project.scripts]
+check_multiple = "check_multiple.__main__:main"
+
+[project.urls]
+Homepage = "https://github.com/clarkbox/check_multiple"
+Documentation = "https://github.com/clarkbox/check_multiple/blob/master/README.md"
+Repository = "https://github.com/clarkbox/check_multiple.git"
+Issues = "https://github.com/clarkbox/check_multiple/issues"
+
+[tool.setuptools.packages.find]
+where = ["lib"]
diff --git a/setup.py b/setup.py
deleted file mode 100644
index 8034e65..0000000
--- a/setup.py
+++ /dev/null
@@ -1,23 +0,0 @@
-from distutils.core import setup
-
-setup(
-  name         = 'nagios-check_multiple',
-  version      = '0.0.1',
-  maintainer       = 'Clark A',
-  maintainer_email = 'clarka@gmail.com',
-  url          = 'https://github.com/clarkbox/check_multiple',
-  scripts      = ['bin/check_multiple'],
-  packages     = ['check_multiple'],
-  package_dir  = {'check_multiple': 'lib/check_multiple'},
-  description  = 'Run multiple Nagios checks and combine the results',
-  long_description=open('README.md').read(),
-  classifiers  = [
-    'Programming Language :: Python :: 3.5',
-    'Programming Language :: Python :: 3.6',
-    'Programming Language :: Python :: 3.7',
-    'Programming Language :: Python :: 3.8',
-    'Environment :: Console',
-    'Intended Audience :: System Administrators',
-    'License :: OSI Approved :: MIT License',
-  ]
-)