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From: Tilman Linneweh <arved@FreeBSD.org>
Date: Wed, 25 Mar 2009 12:48:39 +0100
To: Doug Barton <dougb@FreeBSD.org>
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Cc: Tilman Linneweh <arved@FreeBSD.org>, freebsd-ports@FreeBSD.org
Subject: Re: MAKE_JOBS_SAFE with gmake
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On Mar 24, 2009, at 20:43, Doug Barton wrote:
> I'm testing my ports for MAKE_JOBS_SAFE-ness, and came across this
> message when building xscreensaver (which uses gmake):
>
> gmake[1]: warning: jobserver unavailable: using -j1.  Add `+' to
> parent make rule.
>
> I have zero gmake fu, can anyone help me make sense of that? The good
> news is that the build finished successfully ...

I have noticed that this happens if somewhere in the Buildsystem a  
sub-make is called with
"make"/"gmake" instead of "$(MAKE)"