The Debian package has the following changes: The caching implementation was disabled, degrading the performance, but enabling us to install a system-wide shared copy of this library. The exact implications are: - %Cache.DefinitionImpl was changed to null fom 'Serializer' so you must change this back if you desire caching. - If %Cache.SerializerPath is not set, it no longer defaults to the upstream location, which lives in /usr and thus is system-wide and read-only. Instead, it aborts. So, if you re-enable caching to speed up performance, you MUST set it to a directory writable to your user / application.