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1) This port does not install any doom .wad ,
so you have to download it and run prboom -iwad /path/to/doom.wad 
or put it in /usr/local/share/games/doom/ !

2) Prboom is very out of date (http://prboom.sourceforge.net), so 
if you like prboom and  want a newer version 
you should look at http://prboom-plus.sourceforge.net!

3)Have fun!
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