[Lazarus] How to tell lazarus the location of a used package?

[waldo kitty]

On 11/25/2010 06:09, Bo Berglund wrote:
>>> Now, the description on how packages work in lazarus leads me to
>>> believe that any given package can only exist in one single copy and
>>> this location is not inside the project code space.
>>
>> Each package/project should have its own directories. This ensures
>> that a package does not depend on a project, so it can work with many
>> projects.
>
> Not if they evolve and we must maintain old code when we need to
> return to an older time...

isn't this what a versioning system is supposed to be able to take care of?? 
simply check out the old version and do what you have to do?