selecting between different gcc

I have installed gcc47 and gcc48 from the ports for FREEBSD 9.

My question, is to use the different gcc's, is it just a matter of pointing to the correct gcc48 or gcc47? What about the include directories, etc (as it goes to /usr/include, wouldn't that pick up the old gcc 4.2.1 includes that in that directory)?

THis is for my own development, not building ports (I understand the make.conf and library setting).
 
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