How to activate an older version of a port

[Lawrence Velázquez]

On Jan 12, 2013, at 1:39 AM, Jerry <lanceboyle at qwest.net> wrote:

> I want to temporarily roll back macports automake to 1.11.3. I get this:
> 
> $ port installed automake
> The following ports are currently installed:
>  automake @1.11.3_0
>  automake @1.11.4_0
>  automake @1.12_0
>  automake @1.12.2_0
>  automake @1.12.5_0 (active)
> 
> so it should be possible (right?) but I can't find the command to do this although I think I once saw it.
> 
> How can I activate an older version of automake and then re-activate the newest version later?

$ sudo port activate automake @1.11.3_0
$ [yada yada yada]
$ sudo port activate automake @1.12.5_0

vq