Summary for building a FreeBSD kernel:

Old Way (<= 4.x):
--------
 1.) Configure the kernel:
 	cd /usr/src/sys/i386/conf/
	cp GENERIC MYKERNEL
	edit MYKERNEL

 2.) # config MYKERNEL
 3.) cd ../compile/MYKERNEL
 4.) make depend && make && make install

New Way (5.x):
--------
 1.) Config the kernel
 2.) cd /usr/src
 3.) make buildkernel KERNCONF=MYKERNEL
 4.) make installkernel KERNCONF=MYKERNEL

 If you don't have the entire source tree (/usr/src), build
 using the old method (as the Makefiles will be missing).