Ignore build and dist only if setuptools present

Author: root

src/_pytest/main.py

@@ -421,6 +421,11 @@ def pytest_ignore_collect(collection_path: Path, config: Config) -> bool | None:
         if any(fnmatch_ex(pat, collection_path) for pat in norecursepatterns):
             return True
 
+        if any(fnmatch_ex(pat, collection_path) for pat in ("build", "dist")):
+            parent = collection_path.parent
+            if (parent / "setup.py").exists() or (parent / "setup.cfg").exists():
+                return True
+
     return None