> Am 02.10.2015 um 16:33 schrieb Ryan Schmidt <ryandes...@macports.org>:
> 
> We're trying to make MacPorts into a system that just works, and that means 
> that when we discover common situations where MacPorts fails to work, we try 
> to modify MacPorts so that users are less likely to encounter them. One of 
> the common problems we discovered was when MacPorts is built on one version 
> of OS X and used on another version of OS X. So now we prevent that, via the 
> error message that caused you to begin this thread.

I just want to share my experience with updating MacPorts today. The migration 
page describes that one should install the new base by the using the PKGs and 
AFTER that get list of all installed ports to reinstall them. That led me to 
the conclusion, that updating the base would not result in the package database 
being wiped. So I did just that and ran "port upgrade outdated" afterwards, 
which completed successfully. After all the discussion on this thread I 
understand why the migration steps are described as they are and what problems 
might arise from upgrading that way. However, for me and for this particular 
update, it worked very well. It still rebuild most of the packages though.

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