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Date: Fri, 26 Oct 2007 14:31:43 +0500
From: rihad <rihad@mail.ru>
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Subject: make -DNOCLEAN buildworld taking a long time
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I'm frequently doing cd /usr/src/ && make update, and then the whole 
buildworld/kernel/mergemaster dance.  Why is make -DNOCLEAN buildworld 
kernel taking a long time rebuilding most parts? Shouldn't it only build 
whatever has changed?

Thanks.