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Date: Fri, 23 May 2008 09:42:33 +0200 (CEST)
From: Radomir Skrbek <radomir.skrbek@telekomaustria.cz>
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Subject: error:make:don't know how to make buildkernel.stop
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For make buildkernel you must have source:
 src-sys
 src-base   <<<<<<<

I had the same problem. :-)