Buildworld GCC version

[Richard Beyer]

I understand the gcc version that buildworld uses is the system version 
(e.g.)

> tsmel> gcc -v
> Using builtin specs.
> gcc version 2.95.4 20020320 [FreeBSD]

If I've installed gcc3.3 how can I change the default compiler so that it 
uses the updated version, or is there some reason I should leave it on 
gcc2.95

Cheers,
Richard