112 files changed, 282 insertions, 65 deletions

diff --git a/README b/distutils/README
index 23f48850..23f48850 100644
--- a/README
+++ b/distutils/README
diff --git a/__init__.py b/distutils/__init__.py
index d823d040..d823d040 100644
--- a/__init__.py
+++ b/distutils/__init__.py
diff --git a/_msvccompiler.py b/distutils/_msvccompiler.py
index af8099a4..af8099a4 100644
--- a/_msvccompiler.py
+++ b/distutils/_msvccompiler.py
diff --git a/archive_util.py b/distutils/archive_util.py
index 565a3117..565a3117 100644
--- a/archive_util.py
+++ b/distutils/archive_util.py
diff --git a/bcppcompiler.py b/distutils/bcppcompiler.py
index 071fea5d..071fea5d 100644
--- a/bcppcompiler.py
+++ b/distutils/bcppcompiler.py
diff --git a/ccompiler.py b/distutils/ccompiler.py
index b5ef143e..b5ef143e 100644
--- a/ccompiler.py
+++ b/distutils/ccompiler.py
diff --git a/cmd.py b/distutils/cmd.py
index dba3191e..dba3191e 100644
--- a/cmd.py
+++ b/distutils/cmd.py
diff --git a/command/__init__.py b/distutils/command/__init__.py
index 481eea9f..481eea9f 100644
--- a/command/__init__.py
+++ b/distutils/command/__init__.py
diff --git a/command/bdist.py b/distutils/command/bdist.py
index 014871d2..014871d2 100644
--- a/command/bdist.py
+++ b/distutils/command/bdist.py
diff --git a/command/bdist_dumb.py b/distutils/command/bdist_dumb.py
index f0d6b5b8..f0d6b5b8 100644
--- a/command/bdist_dumb.py
+++ b/distutils/command/bdist_dumb.py
diff --git a/command/bdist_msi.py b/distutils/command/bdist_msi.py
index 0863a188..0863a188 100644
--- a/command/bdist_msi.py
+++ b/distutils/command/bdist_msi.py
diff --git a/command/bdist_rpm.py b/distutils/command/bdist_rpm.py
index 550cbfa1..550cbfa1 100644
--- a/command/bdist_rpm.py
+++ b/distutils/command/bdist_rpm.py
diff --git a/command/bdist_wininst.py b/distutils/command/bdist_wininst.py
index 0e9ddaa2..0e9ddaa2 100644
--- a/command/bdist_wininst.py
+++ b/distutils/command/bdist_wininst.py
diff --git a/command/build.py b/distutils/command/build.py
index a86df0bc..a86df0bc 100644
--- a/command/build.py
+++ b/distutils/command/build.py
diff --git a/command/build_clib.py b/distutils/command/build_clib.py
index 3e20ef23..3e20ef23 100644
--- a/command/build_clib.py
+++ b/distutils/command/build_clib.py
diff --git a/command/build_ext.py b/distutils/command/build_ext.py
index 1a9bd120..1a9bd120 100644
--- a/command/build_ext.py
+++ b/distutils/command/build_ext.py
diff --git a/command/build_py.py b/distutils/command/build_py.py
index edc2171c..edc2171c 100644
--- a/command/build_py.py
+++ b/distutils/command/build_py.py
diff --git a/command/build_scripts.py b/distutils/command/build_scripts.py
index ccc70e64..ccc70e64 100644
--- a/command/build_scripts.py
+++ b/distutils/command/build_scripts.py
diff --git a/command/check.py b/distutils/command/check.py
index ada25006..ada25006 100644
--- a/command/check.py
+++ b/distutils/command/check.py
diff --git a/command/clean.py b/distutils/command/clean.py
index 0cb27016..0cb27016 100644
--- a/command/clean.py
+++ b/distutils/command/clean.py
diff --git a/command/command_template b/distutils/command/command_template
index 6106819d..6106819d 100644
--- a/command/command_template
+++ b/distutils/command/command_template
diff --git a/command/config.py b/distutils/command/config.py
index aeda408e..aeda408e 100644
--- a/command/config.py
+++ b/distutils/command/config.py
diff --git a/command/install.py b/distutils/command/install.py
index aaa300ef..13feeb89 100644
--- a/command/install.py
+++ b/distutils/command/install.py
@@ -43,6 +43,20 @@ INSTALL_SCHEMES = {
         'data'   : '$base',
         },
     'nt': WINDOWS_SCHEME,
+    'pypy': {
+        'purelib': '$base/site-packages',
+        'platlib': '$base/site-packages',
+        'headers': '$base/include/$dist_name',
+        'scripts': '$base/bin',
+        'data'   : '$base',
+        },
+    'pypy_nt': {
+        'purelib': '$base/site-packages',
+        'platlib': '$base/site-packages',
+        'headers': '$base/include/$dist_name',
+        'scripts': '$base/Scripts',
+        'data'   : '$base',
+        },
     }
 
 # user site schemes
@@ -298,7 +312,7 @@ class install(Command):
                             'sys_exec_prefix': exec_prefix,
                             'exec_prefix': exec_prefix,
                             'abiflags': abiflags,
-                            'platlibdir': sys.platlibdir,
+                            'platlibdir': getattr(sys, 'platlibdir', 'lib'),
                            }
 
         if HAS_USER_SITE:
@@ -455,6 +469,12 @@ class install(Command):
     def select_scheme(self, name):
         """Sets the install directories by applying the install schemes."""
         # it's the caller's problem if they supply a bad name!
+        if (hasattr(sys, 'pypy_version_info') and
+                not name.endswith(('_user', '_home'))):
+            if os.name == 'nt':
+                name = 'pypy_nt'
+            else:
+                name = 'pypy'
         scheme = INSTALL_SCHEMES[name]
         for key in SCHEME_KEYS:
             attrname = 'install_' + key
diff --git a/command/install_data.py b/distutils/command/install_data.py
index 947cd76a..947cd76a 100644
--- a/command/install_data.py
+++ b/distutils/command/install_data.py
diff --git a/command/install_egg_info.py b/distutils/command/install_egg_info.py
index 0ddc7367..0ddc7367 100644
--- a/command/install_egg_info.py
+++ b/distutils/command/install_egg_info.py
diff --git a/command/install_headers.py b/distutils/command/install_headers.py
index 9bb0b18d..9bb0b18d 100644
--- a/command/install_headers.py
+++ b/distutils/command/install_headers.py
diff --git a/command/install_lib.py b/distutils/command/install_lib.py
index 6154cf09..6154cf09 100644
--- a/command/install_lib.py
+++ b/distutils/command/install_lib.py
diff --git a/command/install_scripts.py b/distutils/command/install_scripts.py
index 31a1130e..31a1130e 100644
--- a/command/install_scripts.py
+++ b/distutils/command/install_scripts.py
diff --git a/command/register.py b/distutils/command/register.py
index 0fac94e9..0fac94e9 100644
--- a/command/register.py
+++ b/distutils/command/register.py
diff --git a/command/sdist.py b/distutils/command/sdist.py
index b4996fcb..b4996fcb 100644
--- a/command/sdist.py
+++ b/distutils/command/sdist.py
diff --git a/command/upload.py b/distutils/command/upload.py
index 95e9fda1..95e9fda1 100644
--- a/command/upload.py
+++ b/distutils/command/upload.py
diff --git a/command/wininst-10.0-amd64.exe b/distutils/command/wininst-10.0-amd64.exe
index 6fa0dce1..6fa0dce1 100644
--- a/command/wininst-10.0-amd64.exe
+++ b/distutils/command/wininst-10.0-amd64.exe
diff --git a/command/wininst-10.0.exe b/distutils/command/wininst-10.0.exe
index afc3bc6c..afc3bc6c 100644
--- a/command/wininst-10.0.exe
+++ b/distutils/command/wininst-10.0.exe
diff --git a/command/wininst-14.0-amd64.exe b/distutils/command/wininst-14.0-amd64.exe
index 253c2e2e..253c2e2e 100644
--- a/command/wininst-14.0-amd64.exe
+++ b/distutils/command/wininst-14.0-amd64.exe
diff --git a/command/wininst-14.0.exe b/distutils/command/wininst-14.0.exe
index 46f5f356..46f5f356 100644
--- a/command/wininst-14.0.exe
+++ b/distutils/command/wininst-14.0.exe
diff --git a/command/wininst-6.0.exe b/distutils/command/wininst-6.0.exe
index f57c855a..f57c855a 100644
--- a/command/wininst-6.0.exe
+++ b/distutils/command/wininst-6.0.exe
diff --git a/command/wininst-7.1.exe b/distutils/command/wininst-7.1.exe
index 1433bc1a..1433bc1a 100644
--- a/command/wininst-7.1.exe
+++ b/distutils/command/wininst-7.1.exe
diff --git a/command/wininst-8.0.exe b/distutils/command/wininst-8.0.exe
index 7403bfab..7403bfab 100644
--- a/command/wininst-8.0.exe
+++ b/distutils/command/wininst-8.0.exe
diff --git a/command/wininst-9.0-amd64.exe b/distutils/command/wininst-9.0-amd64.exe
index 94fbd434..94fbd434 100644
--- a/command/wininst-9.0-amd64.exe
+++ b/distutils/command/wininst-9.0-amd64.exe
diff --git a/command/wininst-9.0.exe b/distutils/command/wininst-9.0.exe
index 2ec261f9..2ec261f9 100644
--- a/command/wininst-9.0.exe
+++ b/distutils/command/wininst-9.0.exe
diff --git a/config.py b/distutils/config.py
index 2171abd6..2171abd6 100644
--- a/config.py
+++ b/distutils/config.py
diff --git a/core.py b/distutils/core.py
index d603d4a4..d603d4a4 100644
--- a/core.py
+++ b/distutils/core.py
diff --git a/cygwinccompiler.py b/distutils/cygwinccompiler.py
index 66c12dd3..66c12dd3 100644
--- a/cygwinccompiler.py
+++ b/distutils/cygwinccompiler.py
diff --git a/debug.py b/distutils/debug.py
index daf1660f..daf1660f 100644
--- a/debug.py
+++ b/distutils/debug.py
diff --git a/dep_util.py b/distutils/dep_util.py
index d74f5e4e..d74f5e4e 100644
--- a/dep_util.py
+++ b/distutils/dep_util.py
diff --git a/dir_util.py b/distutils/dir_util.py
index d5cd8e3e..d5cd8e3e 100644
--- a/dir_util.py
+++ b/distutils/dir_util.py
diff --git a/dist.py b/distutils/dist.py
index 6cf0a0d6..37db4d6c 100644
--- a/dist.py
+++ b/distutils/dist.py
@@ -35,7 +35,8 @@ def _ensure_list(value, fieldname):
     elif not isinstance(value, list):
         # passing a tuple or an iterator perhaps, warn and convert
         typename = type(value).__name__
-        msg = f"Warning: '{fieldname}' should be a list, got type '{typename}'"
+        msg = "Warning: '{fieldname}' should be a list, got type '{typename}'"
+        msg = msg.format(**locals())
         log.log(log.WARN, msg)
         value = list(value)
     return value
diff --git a/errors.py b/distutils/errors.py
index 8b93059e..8b93059e 100644
--- a/errors.py
+++ b/distutils/errors.py
diff --git a/extension.py b/distutils/extension.py
index c507da36..c507da36 100644
--- a/extension.py
+++ b/distutils/extension.py
diff --git a/fancy_getopt.py b/distutils/fancy_getopt.py
index 7d170dd2..7d170dd2 100644
--- a/fancy_getopt.py
+++ b/distutils/fancy_getopt.py
diff --git a/file_util.py b/distutils/file_util.py
index b3fee35a..b3fee35a 100644
--- a/file_util.py
+++ b/distutils/file_util.py
diff --git a/filelist.py b/distutils/filelist.py
index c92d5fdb..c92d5fdb 100644
--- a/filelist.py
+++ b/distutils/filelist.py
diff --git a/log.py b/distutils/log.py
index 8ef6b28e..8ef6b28e 100644
--- a/log.py
+++ b/distutils/log.py
diff --git a/msvc9compiler.py b/distutils/msvc9compiler.py
index 6934e964..6934e964 100644
--- a/msvc9compiler.py
+++ b/distutils/msvc9compiler.py
diff --git a/msvccompiler.py b/distutils/msvccompiler.py
index d5857cb1..d5857cb1 100644
--- a/msvccompiler.py
+++ b/distutils/msvccompiler.py
diff --git a/spawn.py b/distutils/spawn.py
index 0d1bd039..0d1bd039 100644
--- a/spawn.py
+++ b/distutils/spawn.py
diff --git a/sysconfig.py b/distutils/sysconfig.py
index 37feae5d..879b6981 100644
--- a/sysconfig.py
+++ b/distutils/sysconfig.py
@@ -16,6 +16,8 @@ import sys
 
 from .errors import DistutilsPlatformError
 
+IS_PYPY = '__pypy__' in sys.builtin_module_names
+
 # These are needed in a couple of spots, so just compute them once.
 PREFIX = os.path.normpath(sys.prefix)
 EXEC_PREFIX = os.path.normpath(sys.exec_prefix)
@@ -97,7 +99,9 @@ def get_python_inc(plat_specific=0, prefix=None):
     """
     if prefix is None:
         prefix = plat_specific and BASE_EXEC_PREFIX or BASE_PREFIX
-    if os.name == "posix":
+    if IS_PYPY:
+        return os.path.join(prefix, 'include')
+    elif os.name == "posix":
         if python_build:
             # Assume the executable is in the build directory.  The
             # pyconfig.h file should be in the same directory.  Since
@@ -138,6 +142,14 @@ def get_python_lib(plat_specific=0, standard_lib=0, prefix=None):
     If 'prefix' is supplied, use it instead of sys.base_prefix or
     sys.base_exec_prefix -- i.e., ignore 'plat_specific'.
     """
+    if IS_PYPY:
+        # PyPy-specific schema
+        if prefix is None:
+            prefix = PREFIX
+        if standard_lib:
+            return os.path.join(prefix, "lib-python", sys.version[0])
+        return os.path.join(prefix, 'site-packages')
+
     if prefix is None:
         if standard_lib:
             prefix = plat_specific and BASE_EXEC_PREFIX or BASE_PREFIX
@@ -148,7 +160,7 @@ def get_python_lib(plat_specific=0, standard_lib=0, prefix=None):
         if plat_specific or standard_lib:
             # Platform-specific modules (any module from a non-pure-Python
             # module distribution) or standard Python library modules.
-            libdir = sys.platlibdir
+            libdir = getattr(sys, "platlibdir", "lib")
         else:
             # Pure Python
             libdir = "lib"
@@ -444,7 +456,12 @@ def _init_posix():
         platform=sys.platform,
         multiarch=getattr(sys.implementation, '_multiarch', ''),
     ))
-    _temp = __import__(name, globals(), locals(), ['build_time_vars'], 0)
+    try:
+        _temp = __import__(name, globals(), locals(), ['build_time_vars'], 0)
+    except ImportError:
+        # Python 3.5 and pypy 7.3.1
+        _temp = __import__(
+            '_sysconfigdata', globals(), locals(), ['build_time_vars'], 0)
     build_time_vars = _temp.build_time_vars
     global _config_vars
     _config_vars = {}
@@ -494,41 +511,42 @@ def get_config_vars(*args):
         _config_vars['prefix'] = PREFIX
         _config_vars['exec_prefix'] = EXEC_PREFIX
 
-        # For backward compatibility, see issue19555
-        SO = _config_vars.get('EXT_SUFFIX')
-        if SO is not None:
-            _config_vars['SO'] = SO
-
-        # Always convert srcdir to an absolute path
-        srcdir = _config_vars.get('srcdir', project_base)
-        if os.name == 'posix':
-            if python_build:
-                # If srcdir is a relative path (typically '.' or '..')
-                # then it should be interpreted relative to the directory
-                # containing Makefile.
-                base = os.path.dirname(get_makefile_filename())
-                srcdir = os.path.join(base, srcdir)
-            else:
-                # srcdir is not meaningful since the installation is
-                # spread about the filesystem.  We choose the
-                # directory containing the Makefile since we know it
-                # exists.
-                srcdir = os.path.dirname(get_makefile_filename())
-        _config_vars['srcdir'] = os.path.abspath(os.path.normpath(srcdir))
-
-        # Convert srcdir into an absolute path if it appears necessary.
-        # Normally it is relative to the build directory.  However, during
-        # testing, for example, we might be running a non-installed python
-        # from a different directory.
-        if python_build and os.name == "posix":
-            base = project_base
-            if (not os.path.isabs(_config_vars['srcdir']) and
-                base != os.getcwd()):
-                # srcdir is relative and we are not in the same directory
-                # as the executable. Assume executable is in the build
-                # directory and make srcdir absolute.
-                srcdir = os.path.join(base, _config_vars['srcdir'])
-                _config_vars['srcdir'] = os.path.normpath(srcdir)
+        if not IS_PYPY:
+            # For backward compatibility, see issue19555
+            SO = _config_vars.get('EXT_SUFFIX')
+            if SO is not None:
+                _config_vars['SO'] = SO
+
+            # Always convert srcdir to an absolute path
+            srcdir = _config_vars.get('srcdir', project_base)
+            if os.name == 'posix':
+                if python_build:
+                    # If srcdir is a relative path (typically '.' or '..')
+                    # then it should be interpreted relative to the directory
+                    # containing Makefile.
+                    base = os.path.dirname(get_makefile_filename())
+                    srcdir = os.path.join(base, srcdir)
+                else:
+                    # srcdir is not meaningful since the installation is
+                    # spread about the filesystem.  We choose the
+                    # directory containing the Makefile since we know it
+                    # exists.
+                    srcdir = os.path.dirname(get_makefile_filename())
+            _config_vars['srcdir'] = os.path.abspath(os.path.normpath(srcdir))
+
+            # Convert srcdir into an absolute path if it appears necessary.
+            # Normally it is relative to the build directory.  However, during
+            # testing, for example, we might be running a non-installed python
+            # from a different directory.
+            if python_build and os.name == "posix":
+                base = project_base
+                if (not os.path.isabs(_config_vars['srcdir']) and
+                    base != os.getcwd()):
+                    # srcdir is relative and we are not in the same directory
+                    # as the executable. Assume executable is in the build
+                    # directory and make srcdir absolute.
+                    srcdir = os.path.join(base, _config_vars['srcdir'])
+                    _config_vars['srcdir'] = os.path.normpath(srcdir)
 
         # OS X platforms require special customization to handle
         # multi-architecture, multi-os-version installers
diff --git a/tests/Setup.sample b/distutils/tests/Setup.sample
index 36c4290d..36c4290d 100644
--- a/tests/Setup.sample
+++ b/distutils/tests/Setup.sample
diff --git a/tests/__init__.py b/distutils/tests/__init__.py
index 16d011fd..c7dcc7ec 100644
--- a/tests/__init__.py
+++ b/distutils/tests/__init__.py
@@ -16,7 +16,8 @@ import os
 import sys
 import unittest
 from test.support import run_unittest
-from test.support.warnings_helper import save_restore_warnings_filters
+
+from .py38compat import save_restore_warnings_filters
 
 
 here = os.path.dirname(__file__) or os.curdir
diff --git a/tests/includetest.rst b/distutils/tests/includetest.rst
index d7b4ae38..d7b4ae38 100644
--- a/tests/includetest.rst
+++ b/distutils/tests/includetest.rst
diff --git a/distutils/tests/py35compat.py b/distutils/tests/py35compat.py
new file mode 100644
index 00000000..0c755261
--- /dev/null
+++ b/distutils/tests/py35compat.py
@@ -0,0 +1,77 @@
+"""
+Backward compatibility support for Python 3.5
+"""
+
+import sys
+import test.support
+import subprocess
+
+
+# copied from Python 3.9 test.support module
+def _missing_compiler_executable(cmd_names=[]):
+    """Check if the compiler components used to build the interpreter exist.
+
+    Check for the existence of the compiler executables whose names are listed
+    in 'cmd_names' or all the compiler executables when 'cmd_names' is empty
+    and return the first missing executable or None when none is found
+    missing.
+
+    """
+    from distutils import ccompiler, sysconfig, spawn
+    compiler = ccompiler.new_compiler()
+    sysconfig.customize_compiler(compiler)
+    for name in compiler.executables:
+        if cmd_names and name not in cmd_names:
+            continue
+        cmd = getattr(compiler, name)
+        if cmd_names:
+            assert cmd is not None, \
+                    "the '%s' executable is not configured" % name
+        elif not cmd:
+            continue
+        if spawn.find_executable(cmd[0]) is None:
+            return cmd[0]
+
+
+missing_compiler_executable = vars(test.support).setdefault(
+    'missing_compiler_executable',
+    _missing_compiler_executable,
+)
+
+
+try:
+    from test.support import unix_shell
+except ImportError:
+    # Adapted from Python 3.9 test.support module
+    is_android = hasattr(sys, 'getandroidapilevel')
+    unix_shell = (
+        None if sys.platform == 'win32' else
+        '/system/bin/sh' if is_android else
+        '/bin/sh'
+    )
+
+
+# copied from Python 3.9 subprocess module
+def _optim_args_from_interpreter_flags():
+    """Return a list of command-line arguments reproducing the current
+    optimization settings in sys.flags."""
+    args = []
+    value = sys.flags.optimize
+    if value > 0:
+        args.append('-' + 'O' * value)
+    return args
+
+
+vars(subprocess).setdefault(
+    '_optim_args_from_interpreter_flags',
+    _optim_args_from_interpreter_flags,
+)
+
+
+def adapt_glob(regex):
+    """
+    Supply legacy expectation on Python 3.5
+    """
+    if sys.version_info > (3, 6):
+        return regex
+    return regex.replace('(?s:', '').replace(r')\Z', r'\Z(?ms)')
diff --git a/distutils/tests/py38compat.py b/distutils/tests/py38compat.py
new file mode 100644
index 00000000..46ff5758
--- /dev/null
+++ b/distutils/tests/py38compat.py
@@ -0,0 +1,50 @@
+# flake8: noqa
+
+import contextlib
+
+try:
+    from test.support.warnings_helper import check_warnings
+except (ModuleNotFoundError, ImportError):
+    from test.support import check_warnings
+
+
+try:
+    from test.support.os_helper import (
+        change_cwd,
+        rmtree,
+        EnvironmentVarGuard,
+        TESTFN,
+        unlink,
+        skip_unless_symlink,
+        temp_dir,
+        create_empty_file,
+        temp_cwd,
+    )
+except (ModuleNotFoundError, ImportError):
+    from test.support import (
+        change_cwd,
+        rmtree,
+        EnvironmentVarGuard,
+        TESTFN,
+        unlink,
+        skip_unless_symlink,
+        temp_dir,
+        create_empty_file,
+        temp_cwd,
+    )
+
+
+# From Python 3.9
+@contextlib.contextmanager
+def _save_restore_warnings_filters():
+    old_filters = warnings.filters[:]
+    try:
+        yield
+    finally:
+        warnings.filters[:] = old_filters
+
+
+try:
+    from test.support.warnings_helper import save_restore_warnings_filters
+except (ModuleNotFoundError, ImportError):
+    save_restore_warnings_filters = _save_restore_warnings_filters
diff --git a/tests/support.py b/distutils/tests/support.py
index 23b907b6..b4410fc9 100644
--- a/tests/support.py
+++ b/distutils/tests/support.py
@@ -6,7 +6,8 @@ import tempfile
 import unittest
 import sysconfig
 from copy import deepcopy
-from test.support import os_helper
+
+from . import py38compat as os_helper
 
 from distutils import log
 from distutils.log import DEBUG, INFO, WARN, ERROR, FATAL
diff --git a/tests/test_archive_util.py b/distutils/tests/test_archive_util.py
index edcec251..ce6456dc 100644
--- a/tests/test_archive_util.py
+++ b/distutils/tests/test_archive_util.py
@@ -14,8 +14,9 @@ from distutils.archive_util import (check_archive_formats, make_tarball,
 from distutils.spawn import find_executable, spawn
 from distutils.tests import support
 from test.support import run_unittest, patch
-from test.support.os_helper import change_cwd
-from test.support.warnings_helper import check_warnings
+
+from .py38compat import change_cwd
+from .py38compat import check_warnings
 
 try:
     import grp
diff --git a/tests/test_bdist.py b/distutils/tests/test_bdist.py
index 130d8bf1..130d8bf1 100644
--- a/tests/test_bdist.py
+++ b/distutils/tests/test_bdist.py
diff --git a/tests/test_bdist_dumb.py b/distutils/tests/test_bdist_dumb.py
index 01a233bc..01a233bc 100644
--- a/tests/test_bdist_dumb.py
+++ b/distutils/tests/test_bdist_dumb.py
diff --git a/tests/test_bdist_msi.py b/distutils/tests/test_bdist_msi.py
index a61266a1..937266f8 100644
--- a/tests/test_bdist_msi.py
+++ b/distutils/tests/test_bdist_msi.py
@@ -2,9 +2,10 @@
 import sys
 import unittest
 from test.support import run_unittest
-from test.support.warnings_helper import check_warnings
 from distutils.tests import support
 
+from .py38compat import check_warnings
+
 
 @unittest.skipUnless(sys.platform == 'win32', 'these tests require Windows')
 class BDistMSITestCase(support.TempdirManager,
diff --git a/tests/test_bdist_rpm.py b/distutils/tests/test_bdist_rpm.py
index 6453a02b..6453a02b 100644
--- a/tests/test_bdist_rpm.py
+++ b/distutils/tests/test_bdist_rpm.py
diff --git a/tests/test_bdist_wininst.py b/distutils/tests/test_bdist_wininst.py
index c338069a..31cf2628 100644
--- a/tests/test_bdist_wininst.py
+++ b/distutils/tests/test_bdist_wininst.py
@@ -3,7 +3,8 @@ import sys
 import platform
 import unittest
 from test.support import run_unittest
-from test.support.warnings_helper import check_warnings
+
+from .py38compat import check_warnings
 
 from distutils.command.bdist_wininst import bdist_wininst
 from distutils.tests import support
diff --git a/tests/test_build.py b/distutils/tests/test_build.py
index b020a5ba..b020a5ba 100644
--- a/tests/test_build.py
+++ b/distutils/tests/test_build.py
diff --git a/tests/test_build_clib.py b/distutils/tests/test_build_clib.py
index abd83137..259c4352 100644
--- a/tests/test_build_clib.py
+++ b/distutils/tests/test_build_clib.py
@@ -3,7 +3,9 @@ import unittest
 import os
 import sys
 
-from test.support import run_unittest, missing_compiler_executable
+from test.support import run_unittest
+
+from .py35compat import missing_compiler_executable
 
 from distutils.command.build_clib import build_clib
 from distutils.errors import DistutilsSetupError
diff --git a/tests/test_build_ext.py b/distutils/tests/test_build_ext.py
index f9e0d766..5a72458c 100644
--- a/tests/test_build_ext.py
+++ b/distutils/tests/test_build_ext.py
@@ -15,7 +15,7 @@ from distutils.errors import (
 
 import unittest
 from test import support
-from test.support import os_helper
+from . import py38compat as os_helper
 from test.support.script_helper import assert_python_ok
 
 # http://bugs.python.org/issue4373
@@ -83,7 +83,7 @@ class BuildExtTestCase(TempdirManager,
         else:
             ALREADY_TESTED = type(self).__name__
 
-        code = textwrap.dedent(f"""
+        code = textwrap.dedent("""
             tmp_dir = {self.tmp_dir!r}
 
             import sys
@@ -109,7 +109,7 @@ class BuildExtTestCase(TempdirManager,
 
 
             unittest.main()
-        """)
+        """.format(**locals()))
         assert_python_ok('-c', code)
 
     def test_solaris_enable_shared(self):
diff --git a/tests/test_build_py.py b/distutils/tests/test_build_py.py
index 0712e92c..0712e92c 100644
--- a/tests/test_build_py.py
+++ b/distutils/tests/test_build_py.py
diff --git a/tests/test_build_scripts.py b/distutils/tests/test_build_scripts.py
index 954fc763..954fc763 100644
--- a/tests/test_build_scripts.py
+++ b/distutils/tests/test_build_scripts.py
diff --git a/tests/test_check.py b/distutils/tests/test_check.py
index e534aca1..e534aca1 100644
--- a/tests/test_check.py
+++ b/distutils/tests/test_check.py
diff --git a/tests/test_clean.py b/distutils/tests/test_clean.py
index c605afd8..c605afd8 100644
--- a/tests/test_clean.py
+++ b/distutils/tests/test_clean.py
diff --git a/tests/test_cmd.py b/distutils/tests/test_cmd.py
index cf5197c3..cf5197c3 100644
--- a/tests/test_cmd.py
+++ b/distutils/tests/test_cmd.py
diff --git a/tests/test_config.py b/distutils/tests/test_config.py
index 344084af..344084af 100644
--- a/tests/test_config.py
+++ b/distutils/tests/test_config.py
diff --git a/tests/test_config_cmd.py b/distutils/tests/test_config_cmd.py
index 9aeab07b..4cd9a6b9 100644
--- a/tests/test_config_cmd.py
+++ b/distutils/tests/test_config_cmd.py
@@ -2,7 +2,9 @@
 import unittest
 import os
 import sys
-from test.support import run_unittest, missing_compiler_executable
+from test.support import run_unittest
+
+from .py35compat import missing_compiler_executable
 
 from distutils.command.config import dump_file, config
 from distutils.tests import support
diff --git a/tests/test_core.py b/distutils/tests/test_core.py
index 4e6694a3..666ff4a3 100644
--- a/tests/test_core.py
+++ b/distutils/tests/test_core.py
@@ -6,7 +6,7 @@ import os
 import shutil
 import sys
 from test.support import captured_stdout, run_unittest
-from test.support import os_helper
+from . import py38compat as os_helper
 import unittest
 from distutils.tests import support
 from distutils import log
diff --git a/tests/test_cygwinccompiler.py b/distutils/tests/test_cygwinccompiler.py
index 9dc869de..9dc869de 100644
--- a/tests/test_cygwinccompiler.py
+++ b/distutils/tests/test_cygwinccompiler.py
diff --git a/tests/test_dep_util.py b/distutils/tests/test_dep_util.py
index c6fae39c..c6fae39c 100644
--- a/tests/test_dep_util.py
+++ b/distutils/tests/test_dep_util.py
diff --git a/tests/test_dir_util.py b/distutils/tests/test_dir_util.py
index d436cf83..d436cf83 100644
--- a/tests/test_dir_util.py
+++ b/distutils/tests/test_dir_util.py
diff --git a/tests/test_dist.py b/distutils/tests/test_dist.py
index f8a9e86b..45eadee8 100644
--- a/tests/test_dist.py
+++ b/distutils/tests/test_dist.py
@@ -14,7 +14,7 @@ from distutils.cmd import Command
 from test.support import (
      captured_stdout, captured_stderr, run_unittest
 )
-from test.support.os_helper import TESTFN
+from .py38compat import TESTFN
 from distutils.tests import support
 from distutils import log
 
@@ -84,6 +84,10 @@ class DistributionTestCase(support.LoggingSilencer,
         self.assertIsInstance(cmd, test_dist)
         self.assertEqual(cmd.sample_option, "sometext")
 
+    @unittest.skipIf(
+        'distutils' not in Distribution.parse_config_files.__module__,
+        'Cannot test when virtualenv has monkey-patched Distribution.',
+    )
     def test_venv_install_options(self):
         sys.argv.append("install")
         self.addCleanup(os.unlink, TESTFN)
diff --git a/tests/test_extension.py b/distutils/tests/test_extension.py
index 81fad02d..2eb5b422 100644
--- a/tests/test_extension.py
+++ b/distutils/tests/test_extension.py
@@ -4,9 +4,10 @@ import os
 import warnings
 
 from test.support import run_unittest
-from test.support.warnings_helper import check_warnings
 from distutils.extension import read_setup_file, Extension
 
+from .py38compat import check_warnings
+
 class ExtensionTestCase(unittest.TestCase):
 
     def test_read_setup_file(self):
diff --git a/tests/test_file_util.py b/distutils/tests/test_file_util.py
index c7783b85..d2536075 100644
--- a/tests/test_file_util.py
+++ b/distutils/tests/test_file_util.py
@@ -9,7 +9,7 @@ from distutils import log
 from distutils.tests import support
 from distutils.errors import DistutilsFileError
 from test.support import run_unittest
-from test.support.os_helper import unlink
+from .py38compat import unlink
 
 
 class FileUtilTestCase(support.TempdirManager, unittest.TestCase):
diff --git a/tests/test_filelist.py b/distutils/tests/test_filelist.py
index cee97d43..d8e4b39f 100644
--- a/tests/test_filelist.py
+++ b/distutils/tests/test_filelist.py
@@ -8,10 +8,13 @@ from distutils.errors import DistutilsTemplateError
 from distutils.filelist import glob_to_re, translate_pattern, FileList
 from distutils import filelist
 
-from test.support import os_helper
 from test.support import captured_stdout, run_unittest
 from distutils.tests import support
 
+from .py35compat import adapt_glob
+from . import py38compat as os_helper
+
+
 MANIFEST_IN = """\
 include ok
 include xo
@@ -60,7 +63,7 @@ class FileListTestCase(support.LoggingSilencer,
             ('foo????', r'(?s:foo[^%(sep)s][^%(sep)s][^%(sep)s][^%(sep)s])\Z'),
             (r'foo\\??', r'(?s:foo\\\\[^%(sep)s][^%(sep)s])\Z')):
             regex = regex % {'sep': sep}
-            self.assertEqual(glob_to_re(glob), regex)
+            self.assertEqual(glob_to_re(glob), adapt_glob(regex))
 
     def test_process_template_line(self):
         # testing  all MANIFEST.in template patterns
diff --git a/tests/test_install.py b/distutils/tests/test_install.py
index 51c80e04..eb684a09 100644
--- a/tests/test_install.py
+++ b/distutils/tests/test_install.py
@@ -58,7 +58,8 @@ class InstallTestCase(support.TempdirManager,
 
         libdir = os.path.join(destination, "lib", "python")
         check_path(cmd.install_lib, libdir)
-        platlibdir = os.path.join(destination, sys.platlibdir, "python")
+        _platlibdir = getattr(sys, "platlibdir", "lib")
+        platlibdir = os.path.join(destination, _platlibdir, "python")
         check_path(cmd.install_platlib, platlibdir)
         check_path(cmd.install_purelib, libdir)
         check_path(cmd.install_headers,
diff --git a/tests/test_install_data.py b/distutils/tests/test_install_data.py
index 32ab296a..32ab296a 100644
--- a/tests/test_install_data.py
+++ b/distutils/tests/test_install_data.py
diff --git a/tests/test_install_headers.py b/distutils/tests/test_install_headers.py
index 2217b321..2217b321 100644
--- a/tests/test_install_headers.py
+++ b/distutils/tests/test_install_headers.py
diff --git a/tests/test_install_lib.py b/distutils/tests/test_install_lib.py
index fda6315b..fda6315b 100644
--- a/tests/test_install_lib.py
+++ b/distutils/tests/test_install_lib.py
diff --git a/tests/test_install_scripts.py b/distutils/tests/test_install_scripts.py
index 1f7b1038..1f7b1038 100644
--- a/tests/test_install_scripts.py
+++ b/distutils/tests/test_install_scripts.py
diff --git a/tests/test_log.py b/distutils/tests/test_log.py
index 75cf9006..75cf9006 100644
--- a/tests/test_log.py
+++ b/distutils/tests/test_log.py
diff --git a/tests/test_msvc9compiler.py b/distutils/tests/test_msvc9compiler.py
index 77a07ef3..77a07ef3 100644
--- a/tests/test_msvc9compiler.py
+++ b/distutils/tests/test_msvc9compiler.py
diff --git a/tests/test_msvccompiler.py b/distutils/tests/test_msvccompiler.py
index b518d6a7..b518d6a7 100644
--- a/tests/test_msvccompiler.py
+++ b/distutils/tests/test_msvccompiler.py
diff --git a/tests/test_register.py b/distutils/tests/test_register.py
index bba48633..84607f99 100644
--- a/tests/test_register.py
+++ b/distutils/tests/test_register.py
@@ -6,7 +6,8 @@ import urllib
 import warnings
 
 from test.support import run_unittest
-from test.support.warnings_helper import check_warnings
+
+from .py38compat import check_warnings
 
 from distutils.command import register as register_module
 from distutils.command.register import register
diff --git a/tests/test_sdist.py b/distutils/tests/test_sdist.py
index 752e9db5..b087a817 100644
--- a/tests/test_sdist.py
+++ b/distutils/tests/test_sdist.py
@@ -7,7 +7,8 @@ import zipfile
 from os.path import join
 from textwrap import dedent
 from test.support import captured_stdout, run_unittest
-from test.support.warnings_helper import check_warnings
+
+from .py38compat import check_warnings
 
 try:
     import zlib
diff --git a/tests/test_spawn.py b/distutils/tests/test_spawn.py
index 4ec767b1..f620da78 100644
--- a/tests/test_spawn.py
+++ b/distutils/tests/test_spawn.py
@@ -3,8 +3,10 @@ import os
 import stat
 import sys
 import unittest.mock
-from test.support import run_unittest, unix_shell
-from test.support import os_helper
+from test.support import run_unittest
+
+from .py35compat import unix_shell
+from . import py38compat as os_helper
 
 from distutils.spawn import find_executable
 from distutils.spawn import spawn
diff --git a/tests/test_sysconfig.py b/distutils/tests/test_sysconfig.py
index 59676b0e..c7571942 100644
--- a/tests/test_sysconfig.py
+++ b/distutils/tests/test_sysconfig.py
@@ -11,8 +11,9 @@ from distutils import sysconfig
 from distutils.ccompiler import get_default_compiler
 from distutils.tests import support
 from test.support import run_unittest, swap_item
-from test.support.os_helper import TESTFN
-from test.support.warnings_helper import check_warnings
+
+from .py38compat import TESTFN
+from .py38compat import check_warnings
 
 
 class SysconfigTestCase(support.EnvironGuard, unittest.TestCase):
@@ -48,6 +49,7 @@ class SysconfigTestCase(support.EnvironGuard, unittest.TestCase):
         self.assertIsInstance(cvars, dict)
         self.assertTrue(cvars)
 
+    @unittest.skip('sysconfig.IS_PYPY')
     def test_srcdir(self):
         # See Issues #15322, #15364.
         srcdir = sysconfig.get_config_var('srcdir')
diff --git a/tests/test_text_file.py b/distutils/tests/test_text_file.py
index 7e76240a..7e76240a 100644
--- a/tests/test_text_file.py
+++ b/distutils/tests/test_text_file.py
diff --git a/tests/test_unixccompiler.py b/distutils/tests/test_unixccompiler.py
index eefe4ba4..1828ba1a 100644
--- a/tests/test_unixccompiler.py
+++ b/distutils/tests/test_unixccompiler.py
@@ -2,7 +2,8 @@
 import sys
 import unittest
 from test.support import run_unittest
-from test.support.os_helper import EnvironmentVarGuard
+
+from .py38compat import EnvironmentVarGuard
 
 from distutils import sysconfig
 from distutils.unixccompiler import UnixCCompiler
@@ -12,6 +13,7 @@ class UnixCCompilerTestCase(unittest.TestCase):
     def setUp(self):
         self._backup_platform = sys.platform
         self._backup_get_config_var = sysconfig.get_config_var
+        self._backup_get_config_vars = sysconfig.get_config_vars
         class CompilerWrapper(UnixCCompiler):
             def rpath_foo(self):
                 return self.runtime_library_dir_option('/foo')
@@ -20,6 +22,7 @@ class UnixCCompilerTestCase(unittest.TestCase):
     def tearDown(self):
         sys.platform = self._backup_platform
         sysconfig.get_config_var = self._backup_get_config_var
+        sysconfig.get_config_vars = self._backup_get_config_vars
 
     @unittest.skipIf(sys.platform == 'win32', "can't test on Windows")
     def test_runtime_libdir_option(self):
@@ -111,7 +114,13 @@ class UnixCCompilerTestCase(unittest.TestCase):
             if v == 'LDSHARED':
                 return 'gcc-4.2 -bundle -undefined dynamic_lookup '
             return 'gcc-4.2'
+
+        def gcvs(*args, _orig=sysconfig.get_config_vars):
+            if args:
+                return list(map(sysconfig.get_config_var, args))
+            return _orig()
         sysconfig.get_config_var = gcv
+        sysconfig.get_config_vars = gcvs
         with EnvironmentVarGuard() as env:
             env['CC'] = 'my_cc'
             del env['LDSHARED']
@@ -127,7 +136,13 @@ class UnixCCompilerTestCase(unittest.TestCase):
             if v == 'LDSHARED':
                 return 'gcc-4.2 -bundle -undefined dynamic_lookup '
             return 'gcc-4.2'
+
+        def gcvs(*args, _orig=sysconfig.get_config_vars):
+            if args:
+                return list(map(sysconfig.get_config_var, args))
+            return _orig()
         sysconfig.get_config_var = gcv
+        sysconfig.get_config_vars = gcvs
         with EnvironmentVarGuard() as env:
             env['CC'] = 'my_cc'
             env['LDSHARED'] = 'my_ld -bundle -dynamic'
diff --git a/tests/test_upload.py b/distutils/tests/test_upload.py
index bca5516d..bca5516d 100644
--- a/tests/test_upload.py
+++ b/distutils/tests/test_upload.py
diff --git a/tests/test_util.py b/distutils/tests/test_util.py
index bf0d4333..bf0d4333 100644
--- a/tests/test_util.py
+++ b/distutils/tests/test_util.py
diff --git a/tests/test_version.py b/distutils/tests/test_version.py
index 8671cd2f..8671cd2f 100644
--- a/tests/test_version.py
+++ b/distutils/tests/test_version.py
diff --git a/tests/test_versionpredicate.py b/distutils/tests/test_versionpredicate.py
index 28ae09dc..28ae09dc 100644
--- a/tests/test_versionpredicate.py
+++ b/distutils/tests/test_versionpredicate.py
diff --git a/text_file.py b/distutils/text_file.py
index 93abad38..93abad38 100644
--- a/text_file.py
+++ b/distutils/text_file.py
diff --git a/unixccompiler.py b/distutils/unixccompiler.py
index 4d7a6de7..4d7a6de7 100644
--- a/unixccompiler.py
+++ b/distutils/unixccompiler.py
diff --git a/util.py b/distutils/util.py
index 4b002ece..4b002ece 100644
--- a/util.py
+++ b/distutils/util.py
diff --git a/version.py b/distutils/version.py
index c33bebae..c33bebae 100644
--- a/version.py
+++ b/distutils/version.py
diff --git a/versionpredicate.py b/distutils/versionpredicate.py
index 062c98f2..062c98f2 100644
--- a/versionpredicate.py
+++ b/distutils/versionpredicate.py
diff --git a/pytest.ini b/pytest.ini
new file mode 100644
index 00000000..3e01b439
--- /dev/null
+++ b/pytest.ini
@@ -0,0 +1,4 @@
+[pytest]
+filterwarnings=
+    # acknowledge that TestDistribution isn't a test
+    ignore:cannot collect test class 'TestDistribution'
diff --git a/tox.ini b/tox.ini
new file mode 100644
index 00000000..1590e308
--- /dev/null
+++ b/tox.ini
@@ -0,0 +1,8 @@
+[testenv]
+deps =
+	pytest
+commands =
+	pytest {posargs}
+setenv =
+    PYTHONPATH = {toxinidir}
+skip_install = True