=== modified file 'src/zope/component/zcml.py'
--- src/zope/component/zcml.py	2010-04-06 03:01:29 +0000
+++ src/zope/component/zcml.py	2010-04-11 14:24:49 +0000
@@ -30,7 +30,7 @@
 try:
     from zope.component.security import _checker, proxify, protectedFactory, \
         securityAdapterFactory
-    from zope.security.zcml import Permission
+    from zope.security.zcml import Permission, PublicPermission
 except ImportError:
     SECURITY_SUPPORT = False
     from zope.schema import TextLine as Permission