> On Sep 23, 2016, at 09:04, Ray Zimmerman <r...@cornell.edu> wrote:
> 
>> To build a previous version of a port:
>> 
>> https://trac.macports.org/wiki/howto/InstallingOlderPort
>> 
>> You can have multiple versions of a port installed at the same time, but 
>> only one active and usable at a time. You can switch between them by 
>> activating whichever one you want at the moment, but this may have 
>> consequences for any other installed ports that depend on the port whose 
>> version you're switching.
> 
> Ok, this sounds like something I could make use of now. I’m not familiar with 
> the details of what activating a port does. Is it simply a matter of what 
> get’s put in your executable path, or is there more to it?

An installed port is a compressed tarball of files. Activating a port extracts 
that tarball into /opt/local. 

> I guess my real question is, can I create a few symlinks to be able to 
> execute a deactivated octave port without activating it? If so, that may be 
> good enough for my purposes.

No, when a port is not active, the files you propose to symlink against do not 
exist. 


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