From owner-freebsd-current@FreeBSD.ORG  Tue May 29 03:44:54 2012
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Date: Tue, 29 May 2012 12:44:44 +0900
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Subject: CURRENT: buildworld fails
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I had same problem, but I resolved it.

Maybe, your sort (/usr/bin/sort) is broken.

cd /usr/src
make update
cd usr.bin/sort
make obj depend all install

Then, sort is changed.

make cleandir cleandir
make buildworld