diff --git a/direct/src/extensions_native/Sources.pp b/direct/src/extensions_native/Sources.pp
index e69de29bb2..a961cd35c4 100644
--- a/direct/src/extensions_native/Sources.pp
+++ b/direct/src/extensions_native/Sources.pp
@@ -0,0 +1,20 @@
+#if $[OSX_PLATFORM]
+#output extensions_darwin.py
+#### Generated automatically by $[PPREMAKE] $[PPREMAKE_VERSION] from $[notdir $[THISFILENAME]].
+################################# DO NOT EDIT ###########################
+
+# This defines the shared-library filename extension that is built and
+# imported on OSX.  It's normally .dylib, but in certain Python and
+# OSX versions (for instance, Python 2.4 on OSX 10.4), it appears that
+# we need to generate and import .so files instead, since Python won't
+# import the .dylibs directly.  This is controlled via the BUNDLE_EXT
+# variable defined in Config.pp.
+#if $[BUNDLE_EXT]
+dll_ext = "$[BUNDLE_EXT]"
+#else
+dll_ext = ".dylib"
+#endif
+
+#end extensions_darwin.py
+
+#endif  // OSX_PLATFORM
diff --git a/direct/src/extensions_native/extension_native_helpers.py b/direct/src/extensions_native/extension_native_helpers.py
index bd57aab839..63bf476eb1 100644
--- a/direct/src/extensions_native/extension_native_helpers.py
+++ b/direct/src/extensions_native/extension_native_helpers.py
@@ -21,8 +21,9 @@ if sys.platform == "win32":
     if sys.executable.endswith('_d.exe'):
         dll_suffix = '_d'
 elif sys.platform == "darwin":
-    # On OSX, the dynamic libraries usually end in .dylib.
-    dll_ext = '.dylib'
+    # On OSX, the dynamic libraries usually end in .dylib, but
+    # sometimes we need .so.
+    from extensions_darwin import dll_ext
 else:
     # On most other UNIX systems (including linux), .so is used.
     dll_ext = '.so'