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- Fundamental change in the way how baseregistry hooks into ZCA.
Now it uses hooks.setSite, which requires that zope.component hooks
are in place. Usually they are installed by zope.app.appsetup.
Unless you use zope.app.appsetup, install the hooks with
zope.component.hooks.setHooks().
This applies to zope.component versions >= 3.9.4.