From: mapson AT mapson DOT com (Mapson)
Newsgroups: comp.os.msdos.djgpp
Subject: port of the Doom source code to DJGPP
Date: Sun, 28 Dec 1997 01:24:29 GMT
Organization: Yale University
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To: djgpp AT delorie DOT com
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http://www.classicgaming.com/doom/

That will take you to it. It needs Allegro3.0 to compile. Check out
the link at the site to find out more.