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From: Glenn Morris <rgm@gnu.org>
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Subject: Re: Drop OS X 10.4
Date: Tue, 14 Oct 2014 13:26:55 -0400
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To: Jan =?utf-8?Q?Dj=C3=A4rv?= <jan.h.d@swipnet.se>
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Jan Dj=C3=A4rv wrote:

> I have added a test to configure.

IIUC, I don't think you need to call uname -r again, because that
information is already in $canonical. build-aux/config.guess does:

  UNAME_RELEASE=3D`(uname -r) 2>/dev/null` || UNAME_RELEASE=3Dunknown

and then

  ${UNAME_PROCESSOR}-apple-darwin${UNAME_RELEASE}

So I think it can just be merged into the main $canonical "unported"
test (see eg handling of sunos versions).

> But I was wondering about crosscompiling. We really do not support
> that, do we?

IIRC, we don't support that at all, anywhere.