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From: Richard Stallman <rms@gnu.org>
Newsgroups: gmane.emacs.devel
Subject: Re: Building cvs emacs on a dual-core machine
Date: Wed, 27 Dec 2006 16:16:09 -0500
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Xref: news.gmane.org gmane.emacs.devel:64370
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    So, there's clearly some dependency not being marked properly in the
    Makefiles, but the only solution is to painstakingly go through each and every
    Makefile and see where -j3 would have gone parallel, and make sure there's no
    sequential items, or any items that use a "temp file" with a fixed name.

First of all, which compilation command failed?  That will give us one
side of the problem.  Second, which targets have not yet been made?
That will narrow down the other side, down to a few dozen
possibilities at most, maybe less.

You could probably then figure out by hand which one it is.