What is the recommended setup for crossbuilding kernel+world?

Bakul Shah <[email protected]>
Newsgroups gmane.os.freebsd.devel.hackers
Message-ID <[email protected]> 
Recently crossbuilding -current arm64 world on an 15-stable
amd64 machine took out host's /lib/libsys.so.7 which broke
most everything! I tried rebuilding after removing its
/usr/obj/.../current/arm64.aarch64/ tree and that replaced
many .o files in /usr/lib! Rather than fixup my old setup,
I'd like to know what is recommended.

Is it possible to build as a normal user (so that build can't
mistakenly blow away host's system files)?

Thanks!
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