Index: Lib/distutils/extension.py
===================================================================
--- Lib/distutils/extension.py	(revision 73030)
+++ Lib/distutils/extension.py	(working copy)
@@ -209,7 +209,7 @@
             elif switch == "-U":
                 ext.undef_macros.append(value)
             elif switch == "-C":        # only here 'cause makesetup has it!
-                ext.extra_compile_args.append(word)
+                ext.extra_compile_args.append(value)
             elif switch == "-l":
                 ext.libraries.append(value)
             elif switch == "-L":