[Grml] grml-live, how to hold back packages

[T o n g]

Hi,

How can I use a specific version of package (instead of the latest one) 
when building with grml-live?

Side question, current grml uses aufs-tools version 0+20090302, whereas 
the current aufs-tools version is 20100601-1. Is there anywhere I can 
find this aufs-tools version 0+20090302 that is used to build grml?

Thanks

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