Wouldn't it be better to make sure a MacPorts installation always stays within /opt/local?

[MK-MacPorts at techno.ms]

On 16 Feb 2014, at 22:25 , Jeremy Lavergne <jeremy at lavergne.gotdns.org> wrote:

> You could reboot after each switch: anything that’s no longer linked into /opt/local won’t load, and everything else will launch the appropriate version.

Yes, that’s possible, but to "M$ Windows"-like! ;-)