kernel headers are needed
when you run the nvidia installer it needs to use the kernel headers (definitions of how your kernel is setup) to build the actual nvidia drivers that you will use.
You will need find the header files for the SPECIFIC kernel version that was used in your Xandros 1.1 system and install them i the correct location, unfortunately this can be tricky as it is often different for each Linux distribution.
Sorry I can not provide any distro specific info
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