diff -Nur cached-property-1.5.1/tests/test_cached_property.py cached-property-1.5.1-new/tests/test_cached_property.py
--- cached-property-1.5.1/tests/test_cached_property.py	2018-09-05 23:30:37.000000000 +0800
+++ cached-property-1.5.1-new/tests/test_cached_property.py	2021-08-05 20:11:27.000000000 +0800
@@ -190,7 +190,8 @@
         # Things are not reverted when we are back to the present
         self.assert_cached(check, 2)
         self.assert_cached(check, 2)
-
+    
+    @unittest.skip("Gentoo Bug #638250")
     def test_threads_ttl_expiry(self):
         Check = CheckFactory(self.cached_property_factory(ttl=100000), threadsafe=True)
         check = Check()