diff --git a/stdlib/@tests/stubtest_allowlists/darwin-py311.txt b/stdlib/@tests/stubtest_allowlists/darwin-py311.txt
index b778aba53259..77dc5722ae5e 100644
--- a/stdlib/@tests/stubtest_allowlists/darwin-py311.txt
+++ b/stdlib/@tests/stubtest_allowlists/darwin-py311.txt
@@ -29,3 +29,11 @@ _msi
 msilib(.[a-z]+)?
 ossaudiodev
 spwd
+
+
+# ================
+# Unclear problems
+# ================
+
+# Added in 3.11.1, flagged by stubtest on Python < 3.14 for unknown reasons
+errno.ENOTCAPABLE
diff --git a/stdlib/@tests/stubtest_allowlists/darwin-py312.txt b/stdlib/@tests/stubtest_allowlists/darwin-py312.txt
index 83c6e5e9f44f..cfe4e918f56a 100644
--- a/stdlib/@tests/stubtest_allowlists/darwin-py312.txt
+++ b/stdlib/@tests/stubtest_allowlists/darwin-py312.txt
@@ -17,3 +17,11 @@ _msi
 msilib(.[a-z]+)?
 ossaudiodev
 spwd
+
+
+# ================
+# Unclear problems
+# ================
+
+# Added in 3.11.1, flagged by stubtest on Python < 3.14 for unknown reasons
+errno.ENOTCAPABLE
diff --git a/stdlib/@tests/stubtest_allowlists/darwin-py313.txt b/stdlib/@tests/stubtest_allowlists/darwin-py313.txt
index bb7f4bba4c2f..2d00ecf74464 100644
--- a/stdlib/@tests/stubtest_allowlists/darwin-py313.txt
+++ b/stdlib/@tests/stubtest_allowlists/darwin-py313.txt
@@ -3,3 +3,11 @@
 # =======
 
 (mmap.MAP_32BIT)?  # Exists locally on MacOS but not on GitHub
+
+
+# ================
+# Unclear problems
+# ================
+
+# Added in 3.11.1, flagged by stubtest on Python < 3.14 for unknown reasons
+errno.ENOTCAPABLE
diff --git a/stdlib/errno.pyi b/stdlib/errno.pyi
index 4f19b5aee87e..e025e1fd13b9 100644
--- a/stdlib/errno.pyi
+++ b/stdlib/errno.pyi
@@ -121,6 +121,7 @@ if sys.platform == "darwin":
     ESHLIBVERS: Final[int]
     if sys.version_info >= (3, 11):
         EQFULL: Final[int]
+        ENOTCAPABLE: Final[int]  # available starting with 3.11.1
 
 if sys.platform != "darwin":
     EDEADLOCK: Final[int]