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From: hiro <23hiro@gmail.com>
Date: Tue, 3 Mar 2020 10:06:42 +0000
Message-ID: <CAFSF3XORuFmSriXdoRxSQ8HffYWNLKgce1Sa1YUKYNPpREe8EQ@mail.gmail.com>
Subject: Re: [9front] move zlib source from ghostscript to ape/lib/z and
 update to latest zlib
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X-Bullshit: shared object-oriented cache 

> On one hand, yes -- unifdef will let you do that.  On the other hand,
> unless we make a considered choice to fork fully and actually
> *maintain*

it sounds like this is automatable, you could have a script run
checkout, pull, then unifdef and commit the diff from a 9front branch
to this with a slight addendum to the original commit message noting
this is done automatically. repeat with every new changeset as it
comes in.

downsides are sending patches back upstream, but i doubt there will be
much of those.

there might be more clever ways to do this, but this seems trivial and
sustainable to me.