blob: 4335500e73a80dc9132b31754bee76ff97227f73 (
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diff --git a/src/build/env.py b/src/build/env.py
index b8c7b5f6..f10cf4bf 100644
--- a/src/build/env.py
+++ b/src/build/env.py
@@ -11,6 +11,7 @@
import sysconfig
import tempfile
import typing
+import warnings
from collections.abc import Collection, Mapping
@@ -158,6 +159,15 @@ def _has_valid_outer_pip(self) -> bool | None:
This checks for a valid global pip. Returns None if pip is missing, False
if pip is too old, and True if it can be used.
"""
+ # `pip install --python` is nonfunctional on Gentoo debundled pip.
+ # Detect that by checking if pip._vendor` module exists. However,
+ # searching for pip could yield warnings from _distutils_hack,
+ # so silence them.
+ with warnings.catch_warnings():
+ warnings.simplefilter('ignore')
+ if importlib.util.find_spec('pip._vendor') is None:
+ return False # pragma: no cover
+
# Version to have added the `--python` option.
return _has_dependency('pip', '22.3')
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