The .profile PATH reset is automatically taken care of by the initial MacPorts installer.
But I override it because I only use MacPorts for one thing*, so I don't need it handling any of my other Unix stuff which I prefer to install and manage myself.
Anyway, while reinstalling all the Mobi2Mobi supporting packages to go with the new default version can be tedious, they probably only have to do it once.
Or until their Perl gets updated and breaks the library links, which is what happened on my other computer which doesn't have MacPorts installed.
* I gave up on installing the devel versions of Wine manually as too much hassle, considering how often it got updated.
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