diff --git a/Lib/shutil.py b/Lib/shutil.py
index 5bcfa563fea9af..a278b74fab2ddb 100644
--- a/Lib/shutil.py
+++ b/Lib/shutil.py
@@ -481,7 +481,7 @@ def _copytree(entries, src, dst, symlinks, ignore, copy_function,
     if ignore is not None:
         ignored_names = ignore(os.fspath(src), [x.name for x in entries])
     else:
-        ignored_names = set()
+        ignored_names = ()
 
     os.makedirs(dst, exist_ok=dirs_exist_ok)
     errors = []
diff --git a/Lib/test/libregrtest/main.py b/Lib/test/libregrtest/main.py
index 7cfea548ee2180..56d562d0b068dd 100644
--- a/Lib/test/libregrtest/main.py
+++ b/Lib/test/libregrtest/main.py
@@ -747,11 +747,13 @@ def set_temp_dir(self):
             if sysconfig.is_python_build():
                 self.tmp_dir = sysconfig.get_config_var('abs_builddir')
                 if self.tmp_dir is None:
-                    # gh-74470: On Windows, only srcdir is available. Using
-                    # abs_builddir mostly matters on UNIX when building Python
-                    # out of the source tree, especially when the source tree
-                    # is read only.
-                    self.tmp_dir = sysconfig.get_config_var('srcdir')
+                    self.tmp_dir = sysconfig.get_config_var('abs_srcdir')
+                    if not self.tmp_dir:
+                        # gh-74470: On Windows, only srcdir is available. Using
+                        # abs_builddir mostly matters on UNIX when building
+                        # Python out of the source tree, especially when the
+                        # source tree is read only.
+                        self.tmp_dir = sysconfig.get_config_var('srcdir')
                 self.tmp_dir = os.path.join(self.tmp_dir, 'build')
             else:
                 self.tmp_dir = tempfile.gettempdir()
diff --git a/Lib/test/pythoninfo.py b/Lib/test/pythoninfo.py
index 860c4cc4e0a818..1ec04de3c0c94f 100644
--- a/Lib/test/pythoninfo.py
+++ b/Lib/test/pythoninfo.py
@@ -516,6 +516,8 @@ def collect_sysconfig(info_add):
         'Py_ENABLE_SHARED',
         'SHELL',
         'SOABI',
+        'abs_builddir',
+        'abs_srcdir',
         'prefix',
     ):
         value = sysconfig.get_config_var(name)
diff --git a/Lib/test/test_support.py b/Lib/test/test_support.py
index d3b2922d9b0ad1..b9b05fc4306a31 100644
--- a/Lib/test/test_support.py
+++ b/Lib/test/test_support.py
@@ -767,12 +767,27 @@ def recursive_function(depth):
         #self.assertEqual(available, 2)
 
     def test_copy_python_src_ignore(self):
-        src_dir = sysconfig.get_config_var('srcdir')
+        # Get source directory
+        src_dir = sysconfig.get_config_var('abs_srcdir')
+        if not src_dir:
+            src_dir = sysconfig.get_config_var('srcdir')
         src_dir = os.path.abspath(src_dir)
 
-        ignored = {'.git', '__pycache__'}
+        # Check that the source code is available
+        if not os.path.exists(src_dir):
+            self.skipTest(f"cannot access Python source code directory:"
+                          f" {src_dir!r}")
+        # Check that the landmark copy_python_src_ignore() expects is available
+        # (Previously we looked for 'Lib\os.py', which is always present on Windows.)
+        landmark = os.path.join(src_dir, 'Modules')
+        if not os.path.exists(landmark):
+            self.skipTest(f"cannot access Python source code directory:"
+                          f" {landmark!r} landmark is missing")
+
+        # Test support.copy_python_src_ignore()
 
         # Source code directory
+        ignored = {'.git', '__pycache__'}
         names = os.listdir(src_dir)
         self.assertEqual(support.copy_python_src_ignore(src_dir, names),
                          ignored | {'build'})
@@ -782,7 +797,7 @@ def test_copy_python_src_ignore(self):
         self.assertEqual(support.copy_python_src_ignore(path, os.listdir(path)),
                          ignored | {'build', 'venv'})
 
-        # An other directory
+        # Another directory
         path = os.path.join(src_dir, 'Objects')
         self.assertEqual(support.copy_python_src_ignore(path, os.listdir(path)),
                          ignored)
diff --git a/Lib/test/test_venv.py b/Lib/test/test_venv.py
index 6942bf246b61d1..fea16568afebae 100644
--- a/Lib/test/test_venv.py
+++ b/Lib/test/test_venv.py
@@ -571,7 +571,11 @@ def test_zippath_from_non_installed_posix(self):
                         eachpath,
                         os.path.join(non_installed_dir, platlibdir))
             elif os.path.isfile(os.path.join(eachpath, "os.py")):
-                for name in os.listdir(eachpath):
+                names = os.listdir(eachpath)
+                ignored_names = copy_python_src_ignore(eachpath, names)
+                for name in names:
+                    if name in ignored_names:
+                        continue
                     if name == "site-packages":
                         continue
                     fn = os.path.join(eachpath, name)
diff --git a/Tools/freeze/test/freeze.py b/Tools/freeze/test/freeze.py
index bb15941464e3d1..cdf77c57bbb6ae 100644
--- a/Tools/freeze/test/freeze.py
+++ b/Tools/freeze/test/freeze.py
@@ -7,9 +7,16 @@
 from test import support
 
 
+def get_python_source_dir():
+    src_dir = sysconfig.get_config_var('abs_srcdir')
+    if not src_dir:
+        src_dir = sysconfig.get_config_var('srcdir')
+    return os.path.abspath(src_dir)
+
+
 TESTS_DIR = os.path.dirname(__file__)
 TOOL_ROOT = os.path.dirname(TESTS_DIR)
-SRCDIR = os.path.abspath(sysconfig.get_config_var('srcdir'))
+SRCDIR = get_python_source_dir()
 
 MAKE = shutil.which('make')
 FREEZE = os.path.join(TOOL_ROOT, 'freeze.py')
diff --git a/Tools/patchcheck/patchcheck.py b/Tools/patchcheck/patchcheck.py
index fa3a43af6e6048..e3959ce428c7c5 100755
--- a/Tools/patchcheck/patchcheck.py
+++ b/Tools/patchcheck/patchcheck.py
@@ -11,6 +11,13 @@
 import untabify
 
 
+def get_python_source_dir():
+    src_dir = sysconfig.get_config_var('abs_srcdir')
+    if not src_dir:
+        src_dir = sysconfig.get_config_var('srcdir')
+    return os.path.abspath(src_dir)
+
+
 # Excluded directories which are copies of external libraries:
 # don't check their coding style
 EXCLUDE_DIRS = [
@@ -18,7 +25,7 @@
     os.path.join('Modules', 'expat'),
     os.path.join('Modules', 'zlib'),
     ]
-SRCDIR = sysconfig.get_config_var('srcdir')
+SRCDIR = get_python_source_dir()
 
 
 def n_files_str(count):