z3c.autoinclude does not automatically include a plone package

Posted on September 25, 2012
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Something I stumbled over just recently and is a PEBKAC again. What happens if you create a plone package and you always need to explicitly specify the zcml slot for that package? Check the namespace declaration in the setup.py. That means, what I had configured: 
 namespace_packages=['mooball'],
 entry_points="""
 # -*- Entry points: -*-
 [z3c.autoinclude.plugin]
 target = plone
 """,
But the packages layout was “mooball.portlets.latestcontent”. After digging, I found out that simply the namespace_package is incorrectly declared. Changing it to: 
 namespace_packages=['mooball', 'mooball.portlets'],
 entry_points="""
 # -*- Entry points: -*-
 [z3c.autoinclude.plugin]
 target = plone
 """,

… got it correctly included via z3c.autoinclude.