From: Chris Browne <cbbrowne@acm.org>
Subject: Re: Documentation and explanatory diagrams
Date: Mon, 05 Jul 2010 11:34:33 -0400
Organization: cbbrowne Computing Inc
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	<201007022128.o62LS5l24971@momjian.us>
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bruce@momjian.us (Bruce Momjian) writes:
> Marc G. Fournier wrote:
>> On Fri, 2 Jul 2010, Tom Lane wrote:
>> 
>> > Alvaro Herrera <alvherre@commandprompt.com> writes:
>> >> Excerpts from Peter Eisentraut's message of jue jul 01 21:52:00 -0400 2010:
>> >>> Is there something that makes installing dia more challenging than the
>> >>> other documentation build tools?
>> >
>> >> Err, I dunno -- it's just an apt-get away for me, but what will Tom say
>> >> when it doesn't work on his ancient HP-UX 10.20 system?
>> >
>> > I don't try to build the docs on that box anyway --- it does have
>> > openjade but such an old version that they don't build.  In practice
>> > building the docs already takes much more modern infrastructure than
>> > compiling the source code; and besides there are many fewer people
>> > who care about doing it.
>> >
>> > A more interesting question is whether Marc can install a working
>> > version of dia on whatever he uses to wrap the tarballs.
>> 
>> that shouldn't be an issue ... Peter runs an update every 3 hours on that 
>> machine right now as it is ...
>
> OK, everyone seems to like requiring dia.  I wasn't sure how popular dia
> was.  One hack solution to allow builds without dia would be to create a
> Makefile rule that creates empty PNG files to match the dia files.
>
> Can someone provide the command-line to build the PNG files from the DIA
> files?

Here's a pretty suitable Makefile rule:
    %.png : %.dia; dia --export=$@ $<
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