Zope2 is a package, so that would confuse zpkgutils when building a distro.

Zope2-src is a virtual collection, located at releases/Zope2/ and defines
what goes into a Zope 2 release tarball.

releases/Zope2.cfg

@@ -3,4 +3,4 @@
 build-application     yes
 collect-dependencies  yes
 resource-map          Zope2.map
-default-collection    Zope2
+default-collection    Zope2-src