> The dosemu source packages have "orig" and "diff" in their names. How do > these packages work together?
the "-orig" is the pristine source code, straight from the author(s). I believe that the "-diff" contains the modifications made by the Debian maintainers to make it fit easily into Debian, as diff(1) output. If you want to see the code used to make the actual debian package, untar the "orig", and then use patch(1) to apply the "diff". Personally, I never bother with the diffs -- I like to keep things as simple as possible. (However, you may have to for one reason or another.)