gcc version mismatches

[Jeremy Lavergne]

> I'm not sure what order that would upgrade the ports in. It might not be in dependency order. Also, I think this will probably rebuild ports multiple times, once for each time it appears as a dependency.
> 
> You're better off uninstalling all ports, then installing the ports you want.

So basically follow the migration instructions, just insert "-s" when issuing install commands:

    port -qv installed > myports.txt #make a list of the installed ports
    sudo port uninstall installed # uninstall everything
    sudo port clean all #make sure all build directories are gone
...
    sudo port -s install X +vara -varb Y Z +varc # put everything back together again

The commands can follow some basic set operators if you know what you want to skip things, if helpful for your situation:

    sudo port uninstall installed and not category:kde and not zlib

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