Proper way to build nanobsd with "external" toolchain on new CURRENT?

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 I'm using these settings to build minimal NanoBSD as fast as possible
for long time:

XCC=/usr/bin/cc
XCXX=/usr/bin/c++
XCPP=/usr/bin/cpp
XAS=/usr/bin/as
XAR=/usr/bin/ar
XLD=/usr/bin/ld
XNM=/usr/bin/nm
XOBJDUMP=/usr/bin/objdump
XRANLIB=/usr/bin/ranlib
XSTRINGS=/usr/bin/strings
XSTRIPBIN=/usr/bin/strip
COMPILER_TYPE=clang
WITHOUT_CROSS_COMPILER=yes
WITHOUT_CLANG=yes
WITHOUT_BINUTILS=yes
WITHOUT_GCC=yes

 Where XSTRIPBIN is my addition (or installworld will fail due to absent
"strip" for "install -s").

 This setup is used to build amd64 NanoBSD on amd64 "host" system when
version of "host" is not very old. It allows to avoid building of
compilers completely, which speeds up built significantly (x3! on my
system, really).

 But latest CURRENT has many improvements for external toolchain support.

 Maybe, here are more "official" way to achieve same result?

- -- 
// Lev Serebryakov AKA Black Lion
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