In reply to:

Can I just post this file as-is, or are there legality issues? How does the GNU license work?


Shouldn't be a problem as long as you provide source too (not necessarily in the same package).
AFAI understand the GPL it says that you can do whatever
you want with the code, as long as you do not distribute
your changed code under a less free license. Ie you need to
distribute your changed stuff under GPL too...

/Michael

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/Michael