Patch# 1258 by Christian Heimes: kill basestring.
I like this because it makes the code shorter! :-)
diff --git a/Lib/distutils/unixccompiler.py b/Lib/distutils/unixccompiler.py
index 91d0dff..ee975e1 100644
--- a/Lib/distutils/unixccompiler.py
+++ b/Lib/distutils/unixccompiler.py
@@ -211,7 +211,7 @@
 
         lib_opts = gen_lib_options(self, library_dirs, runtime_library_dirs,
                                    libraries)
-        if not isinstance(output_dir, (basestring, type(None))):
+        if not isinstance(output_dir, (str, type(None))):
             raise TypeError("'output_dir' must be a string or None")
         if output_dir is not None:
             output_filename = os.path.join(output_dir, output_filename)