diff --git a/Lib/test/test_sysconfig.py b/Lib/test/test_sysconfig.py
index cc704228a26..c0f27a67cc7 100644
--- a/Lib/test/test_sysconfig.py
+++ b/Lib/test/test_sysconfig.py
@@ -404,6 +404,10 @@ class TestSysConfig(unittest.TestCase):
             else: # 8 byte pointer size
                 self.assertTrue(suffix.endswith('x86_64-linux-gnu.so'), suffix)
 
+    @unittest.skipUnless(sys.platform == 'darwin', 'OS X-specific test')
+    def test_osx_ext_suffix(self):
+        suffix = sysconfig.get_config_var('EXT_SUFFIX')
+        self.assertTrue(suffix.endswith('-darwin.so'), suffix)
 
 class MakefileTests(unittest.TestCase):
 
diff --git a/Misc/NEWS b/Misc/NEWS
index ca7de81ad9c..0074417e31c 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -12,7 +12,8 @@ Core and Builtins
 
 - Issue #22980: Under Linux, GNU/KFreeBSD and the Hurd, C extensions now include
   the architecture triplet in the extension name, to make it easy to test builds
-  for different ABIs in the same working tree.
+  for different ABIs in the same working tree.  Under OS X, the extension name
+  now includes PEP 3149-style information.
 
 - Issue #22631: Added Linux-specific socket constant CAN_RAW_FD_FRAMES.
   Patch courtesy of Joe Jevnik.
diff --git a/configure b/configure
index 46f82870aab..2e59ac8da57 100755
--- a/configure
+++ b/configure
@@ -5167,6 +5167,8 @@ cat >> conftest.c <<EOF
 # endif
 #elif defined(__gnu_hurd__)
         i386-gnu
+#elif defined(__APPLE__)
+        darwin
 #else
 # error unknown platform triplet
 #endif
@@ -14359,7 +14361,7 @@ $as_echo "$SOABI" >&6; }
 
 
 case $ac_sys_system in
-    Linux*|GNU*)
+    Linux*|GNU*|Darwin)
 	EXT_SUFFIX=.${SOABI}${SHLIB_SUFFIX};;
     *)
 	EXT_SUFFIX=${SHLIB_SUFFIX};;
diff --git a/configure.ac b/configure.ac
index 26d7b361f46..73a0a2f2aee 100644
--- a/configure.ac
+++ b/configure.ac
@@ -826,6 +826,8 @@ cat >> conftest.c <<EOF
 # endif
 #elif defined(__gnu_hurd__)
         i386-gnu
+#elif defined(__APPLE__)
+        darwin
 #else
 # error unknown platform triplet
 #endif
@@ -4310,7 +4312,7 @@ AC_MSG_RESULT($SOABI)
 
 AC_SUBST(EXT_SUFFIX)
 case $ac_sys_system in
-    Linux*|GNU*)
+    Linux*|GNU*|Darwin)
 	EXT_SUFFIX=.${SOABI}${SHLIB_SUFFIX};;
     *)
 	EXT_SUFFIX=${SHLIB_SUFFIX};;