FYI, I've just committed a small change to gerbv to allow more
relaxed parsing of RS-274D files.  We had a bug report demonstrating a
RS-274X file with all polygon fills and no defined apertures from a CAD
package.  Technically, a RS-274X file MUST have an aperture definition,
but I think we ought to try and render it regardless.  So, I've changed
it to try and render suspected RS-274D files.
    Also, I've added some simple logic to create any "dummy" apertures
the file tries to use, and draws them in a very thin line.  This can be
used to roughly visualize a RS-274D file, even with no defined
apertures.  To test, try loading a Gerber file after you delete all the
"%ADD" lines at the start of the file.  This should roughly simulate a
RS-274D file.
    Please test with any RS-274D files you guys might have and let me
know if it has problems or needs improvement.

ps. Stefan, I couldn't fetch your unzip repository....I used the
following command...am I doing something wrong?  Or is the server having
issues?

git fetch git://repo.or.cz/geda-gerbv/spe.git unzip:unzip

Cheers--
Julian
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