I wanted to reach out to the Quake mappers out there. I was fiddling around with the GPL map sources released by Romero back in the days. For one part I noticed that there are some textures being used that are missing in the retail copy of the maps. Since their names are close to others their dimensions can probably be easily guessed or replaced.
On the other hand I noticed that e3m6 does not compile with iD's qbsp tool. I wonder if anyone knows why and how to fix it. The fix may be map wise or application wise..
This isn't the forum for that stuff really. There's a better forum for mappers questions here:
http://www.celephais.net/board/view_thread.php?id=4&start=12085
and you don't have to register.
However, I might answer the question even though I don't do anything with mapping anymore: You need to read what the compiler tells you and you need to know what that error means.
To get educated on that, this file is very helpful: http://user.tninet.se/~xir870k/tooltips.txt
But the following is probably the fix for your problem:
I remember that compiling some Romero's released source maps would cause qbsp to moan about certain textures missing from the .wad file or perhaps the .wad wasn't on my drive. So I changed the .wad key in the editor to the big ass quake.wad that contains all textures from the game (which of course you must have on your drive and setup the editor so that it can actually see it) and then save the map and compile it. Then it worked for me.