diff -u -r1.51 build_ext.py
--- distutils/command/build_ext.py	2000/06/28 01:29:37	1.51
+++ distutils/command/build_ext.py	2000/06/28 10:52:52
@@ -314,7 +314,11 @@
 
         # Wouldn't it be neat if we knew the names of header files too...
         for ext in self.extensions:
-            filenames.extend (ext.sources)
+            # detect if we are using new or old style extenstions
+            if hasattr(ext, 'sources'):
+                filenames.extend (ext.sources)
+            else:
+                filenames.extend (ext[1]['sources'])
 
         return filenames