How to activate an older version of a port

[Jerry]

On Jan 11, 2013, at 11:49 PM, Lawrence Velázquez wrote:

> 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

Ah--thanks, Lawrence.
Jerry