ok thx for the advise and confirmation. I'm using 2.1.6 on 10.04 Ubuntu Server, and it built just fine.
I'll track this down soon. I'm making the 800kb Floppy install of 6.0.8 so I can test for sure on one of these Pluses. They have a lot of nice 6.x software that I want to grab from them, and I don't feel like using sneaker net.