Samuli Suominen posted on Wed, 21 Oct 2009 21:00:43 +0300 as excerpted:

> If a machine is not migrated to a new valid profile then emerge will
> have very limited functionality.

If a machine is not migrated to a new valid profile before the deprecated 
profiles are removed, emerge will have very limited functionality until 
the migration is done.

Alternatively:

If a machine is not migrated to a new valid profile before 2009-12-01,
...

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"Every nonfree program has a lord, a master --
and if you use the program, he is your master."  Richard Stallman