Looking at it now. I appear to have just dumped it to /usr/share/games/doom/prboom.wad
I'm checking the docs now for the command line wad switch
http://manpages.ubuntu.com/manpages/.../prboom.6.html
Quote:
SYNOPSIS
prboom [-complevel lvl]
[-width w] [-height h]
[-iwad iwadname] [-file wad1 ...]
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that should fix it, or linking or
dumping it in the places it wants it. I would choose option 3.
the others are complicated by name needs. (working on resolving them)