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From: Yuri <yuri@rawbw.com>
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Subject: Build of FreeBSD-10 fails on 9 with unknown target CPU
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'make buildworld' fails in llvm build with the message: error: unknown 
target CPU 'amd64'
/etc/make.conf has the line:
CPUTYPE?=core
And CPU is: Intel(R) Core(TM) i7 CPU         920  @ 2.67GHz

/usr/src/UPDATING only says that CPUTYPE should be set with ?=, but the 
build fails with and without CPUTYPE.

What causes the build to fail?

Yuri