I am feeling terrible modifying a tag, but this only influences the old,

classical way to make a Zope 3 release, so noone else is effected 
anyways.

src/persistent/SETUP.cfg

@@ -10,6 +10,7 @@ header  cPersistence.h
 # have to be able to include this indirectly.
 #
 header  ring.h
+header  py24compat.h
 
 
 <extension cPersistence>