distutils/command/install_lib.py references os.extsep.
os.extsep is only available in pythons >= 2.2
(The result, naturally, is an uncaught AttributeError.)

Here's a quick patch (though the patch is flawed if
os.extsep is ever anything but '.' --- is it?)


----Begin Patch----
Index: cvs.2/distutils/command/install_lib.py
--- cvs.2/distutils/command/install_lib.py Mon, 25 Oct
2004 13:00:15 -0700 dairiki (distutils/b/43_install_li
1.1 644)
+++ cvs.2(w)/distutils/command/install_lib.py Tue, 02
Nov 2004 09:48:17 -0800 dairiki
(distutils/b/43_install_li 1.1 644)
@@ -9,7 +9,10 @@


 # Extension for Python source files.
-PYTHON_SOURCE_EXTENSION = os.extsep + "py"
+try:
+    PYTHON_SOURCE_EXTENSION = os.extsep + "py"
+except AttributeError:
+    PYTHON_SOURCE_EXTENSION = '.py'


 class install_lib (Command):
----End Patch----

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A somewhat simpler version:

  PYTHON_SOURCE_EXTENSION = getattr(os, 'extsep', '.') + "py"

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This has been fixed in CVS HEAD, and can be closed. It is
probably  a backport candidate to Python 2.4 (I can't check
if that has been done). It's likely too late for 2.3...

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Closing it as fixed. A backport to 2.3 would be pointless,
since 2.3 does have extsep. This change only matters
assuming there will be a separate distutils release some
day, which is doubtful.