1 files changed, 4 insertions, 10 deletions
diff --git a/setuptools/config/pyprojecttoml.py b/setuptools/config/pyprojecttoml.py
index e20d71d2..9666ca18 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