building many worlds

Hi friends !
By default, building world in FreeBSD will result that world will be localted in /usr/obj, So What is the solution if I want to build defferent worlds, or how to change the destination of binaries ??
example:
1. World A will be located in /usr/obj/w1 and
2. World B will be located in /usr/obj/w2


Thanks in Advence.
 
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