Package::buildArrayOfClassFiles tries to determine class names from file paths
This is a problem if you try to include composer packages that are not namespaced (probably for everything that is not PSR-0 compatible). Because with that a possibly existing folder structure cannot be mapped to namespaces for classes.
If we want to support it (not sure if needed in the long run) we would need a setting per package that switches in a "Extbase" style of determining class names, so instead of converting folders to namespace parts it would create a single class name from the folders separated by underscores. That would work for the simplepie package that I currently try to get working...
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