To add to my last post, I reinstalled kernel sources and now the installer found version.h, so that worked. But still no better framerates, without or with AGP enabled. Does that confirm that the card is not using its hardware for GL rendering? Output from /proc/driver/nvidia/agp/status shows it enabled with 4x,2x and 1x available ( when I used the NvAGP=1 option ).
Dual Athlon MP 1800+
Albatron FX5600XT 128MB
1 GB Kingston PC2100 Reg ECC RAM
Tyan S2466 motherboard