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.