GlDuke is on sourceforge now...And it seems that the project has been continued (last update somewhere in 2003)
The reason why no ports are available is because the source has just been released
I just can't figure out how glDuke made it this far without the sources being released
Anyways, Jaakko actually posted on the newspage that he might look into the code...
So if it's possible to make port without the source (glduke)...why would be impossible for Jaakko, now that the source is released?
The doom engine isn't a real 3D engine as well, so i don't really get your point when you say it's that hard to accomplish
Oh well, I'll just hope he'll do it, if not, I'm sure someone else will