How does Macport work?

[Fon Vitale]

Hi!
Ok. Thank you, but I don't understand why Macports installs things which are
installed. I made the question because I need a program to make diagrams, so
I run:

sudo port -v install dia

One of the dependences of the dependences is perl5.8 and Macports needs
install it, but perl5.8 is alredy installed in my computer (a Macbook).

Coming back whit the C compiler example, if Macports installs the compiler
when I run it what compiler is being running: Macports installed or prior
Macports one?

Thank you.
-- 
Fon Vitale
fonvitale at gmail.com
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