Question about installations of Perl

[Rodolfo Aramayo]

Ryan,

I explicitly requested MacPorts to install

port install perl5.12 +threads

However, I noticed that when I ask:

68# port installed perl5*
The following ports are currently installed:
  perl5 @5.12.3_1+perl5_12 (active)
  perl5.12 @5.12.3_2+threads (active)

Why do I get two ACTIVE installations?? If one was installed by
another port why is it active?
Also how would this affect installation of other ports?? If I request
another port should I request as:
port install p5-* or p5.12-*??

Thanks

--R