> Where can I find the COMPLETE XFree86 2.1 source code tree for
> NetBSD-current?

To compile everything, you need:
1. x11r5 mit sources
2. xfree86-2.1 sources
3. xfree86-2.1 diff (applied against x11r5 sources.)
4. (optionally) xfree86-2.1-2.1.1 diffs

ftp.cs.rmit.edu.au has (1) in pub/X11R5 (as 3 tar files instead of lots
of 500K chunks), and (2-4) in pub/netbsd/XFree86-2.1.1-src.

I recommend that you get (1) from ftp.x.org though.

& I'm glad X11R6 is shipped as <10 tar.gz files instead of heaps of
  500k parts... &

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