--- build_py.py.orig	2005-04-14 16:21:38.000000000 +0200
+++ build_py.py	2005-04-14 16:21:31.000000000 +0200
@@ -114,7 +114,10 @@
             build_dir = os.path.join(*([self.build_lib] + package.split('.')))
 
             # Length of path to strip from found files
-            plen = len(src_dir)+1
+            if src_dir:
+                plen = len(src_dir)+1
+            else:
+                plen = 0
 
             # Strip directory from globbed filenames
             filenames = [