Newbie: compiled and installed gcc-4.2 but ...

[g]

i compiled and installed gcc-4.2 using the instruction on the FreeBSD  
web site.  thanks to kris, who directed me to /usr/ports/lang/ 
gcc ...  and pointed out there was something  unusually wrong with  
what i had done before.

how do i use that version?  when i do gcc -v, i get gcc version 3.4.4  
[FreeBSD] 20050518

i would like to replace this version with the gcc-4.2, or at least  
use the 4.2 version on occasion.

thank everyone,

g.