Deactivating the installed version before trying to install the update

[Adam Mercer]

On Sun, Jan 19, 2014 at 11:37 PM, Ryan Schmidt <ryandesign at macports.org> wrote:

> This situation does not call for the deactivate hack; rather, it calls for the conflicts_build portgroup. (The port would declare a build conflict with itself.)

But that would lead to the build failing without manual intervention,
i.e. manually deactivating the port. I'm trying to automate this so
users don't notice the problem.

Cheers

Adam