kern+world / ports make options

Hello Hackers & Current, 

	I was wondering it if is possible, or if it can be done so a separate set 
of CC, CXX, etc can be specified for building the world and kernel 
independently of a ports build?

	Right now, I use the base GCC to compile the world and kernel, and GCC44 
for most of the other ports (when it complies cleanly). But I have to keep 
editing the /etc/make.conf file to switch between the two. 

	It may already be implemented, but it would be nice if there was 
something defined while the kernel and/or world is being built to that a 
nested block of ifdefs can select which env variables to be set. 

Peg