diff --git a/setuptools/_vendor/_validate_pyproject/NOTICE b/setuptools/config/_validate_pyproject/NOTICE
similarity index 99%
rename from setuptools/_vendor/_validate_pyproject/NOTICE
rename to setuptools/config/_validate_pyproject/NOTICE
index 8ed8325e93..b426f7fd10 100644
--- a/setuptools/_vendor/_validate_pyproject/NOTICE
+++ b/setuptools/config/_validate_pyproject/NOTICE
@@ -1,7 +1,7 @@
 The code contained in this directory was automatically generated using the
 following command:
 
-    python -m validate_pyproject.vendoring --output-dir=setuptools/_vendor/_validate_pyproject --enable-plugins setuptools distutils --very-verbose
+    python -m validate_pyproject.vendoring --output-dir=setuptools/config/_validate_pyproject --enable-plugins setuptools distutils --very-verbose
 
 Please avoid changing it manually.
 
@@ -31,7 +31,7 @@ by the same projects:
 - `__init__.py`
 - `fastjsonschema_validations.py`
 
-The relevant copyright notes and licenses are included below.
+The relevant copyright notes and licenses are included bellow.
 
 
 ***
diff --git a/setuptools/_vendor/_validate_pyproject/__init__.py b/setuptools/config/_validate_pyproject/__init__.py
similarity index 100%
rename from setuptools/_vendor/_validate_pyproject/__init__.py
rename to setuptools/config/_validate_pyproject/__init__.py
diff --git a/setuptools/_vendor/_validate_pyproject/error_reporting.py b/setuptools/config/_validate_pyproject/error_reporting.py
similarity index 100%
rename from setuptools/_vendor/_validate_pyproject/error_reporting.py
rename to setuptools/config/_validate_pyproject/error_reporting.py
diff --git a/setuptools/_vendor/_validate_pyproject/extra_validations.py b/setuptools/config/_validate_pyproject/extra_validations.py
similarity index 100%
rename from setuptools/_vendor/_validate_pyproject/extra_validations.py
rename to setuptools/config/_validate_pyproject/extra_validations.py
diff --git a/setuptools/_vendor/_validate_pyproject/fastjsonschema_exceptions.py b/setuptools/config/_validate_pyproject/fastjsonschema_exceptions.py
similarity index 100%
rename from setuptools/_vendor/_validate_pyproject/fastjsonschema_exceptions.py
rename to setuptools/config/_validate_pyproject/fastjsonschema_exceptions.py
diff --git a/setuptools/_vendor/_validate_pyproject/fastjsonschema_validations.py b/setuptools/config/_validate_pyproject/fastjsonschema_validations.py
similarity index 100%
rename from setuptools/_vendor/_validate_pyproject/fastjsonschema_validations.py
rename to setuptools/config/_validate_pyproject/fastjsonschema_validations.py
diff --git a/setuptools/_vendor/_validate_pyproject/formats.py b/setuptools/config/_validate_pyproject/formats.py
similarity index 100%
rename from setuptools/_vendor/_validate_pyproject/formats.py
rename to setuptools/config/_validate_pyproject/formats.py
diff --git a/setuptools/config/pyprojecttoml.py b/setuptools/config/pyprojecttoml.py
index e20d71d2ff..9666ca182b 100644
--- a/setuptools/config/pyprojecttoml.py
+++ b/setuptools/config/pyprojecttoml.py
@@ -26,18 +26,12 @@ def load_file(filepath: _Path) -> dict:
         return tomli.load(file)
 
 
-def validate(config: dict, filepath: _Path):
-    from setuptools.extern._validate_pyproject import validate as _validate
+def validate(config: dict, filepath: _Path) -> bool:
+    from . import _validate_pyproject as validator
 
     try:
-        return _validate(config)
-    except Exception as ex:
-        if ex.__class__.__name__ != "ValidationError":
-            # Workaround for the fact that `extern` can duplicate imports
-            ex_cls = ex.__class__.__name__
-            error = ValueError(f"invalid pyproject.toml config: {ex_cls} - {ex}")
-            raise error from None
-
+        return validator._validate(config)
+    except validator.ValidationError as ex:
         _logger.error(f"configuration error: {ex.summary}")  # type: ignore
         _logger.debug(ex.details)  # type: ignore
         error = ValueError(f"invalid pyproject.toml config: {ex.name}")  # type: ignore
diff --git a/setuptools/extern/__init__.py b/setuptools/extern/__init__.py
index f09b7faa2c..192e55f6e0 100644
--- a/setuptools/extern/__init__.py
+++ b/setuptools/extern/__init__.py
@@ -71,7 +71,6 @@ def install(self):
 
 names = (
     'packaging', 'pyparsing', 'ordered_set', 'more_itertools', 'importlib_metadata',
-    'zipp', 'importlib_resources', 'jaraco', 'typing_extensions', 'nspektr',
-    'tomli', '_validate_pyproject',
+    'zipp', 'importlib_resources', 'jaraco', 'typing_extensions', 'nspektr', 'tomli',
 )
 VendorImporter(__name__, names, 'setuptools._vendor').install()